Magnesium metal is placed in a solution of copper(II) nitrate. How many grams of the precipitate are formed if we start with 7 g of magnesium metal and 0.5 moles of copper(II) nitrate?

Answers

Answer 1

According to the stoichiometry of the chemical reaction between magnesium and copper nitrate  42.72 g of precipitate is formed  if we start with 7 g of magnesium metal and 0.5 moles of copper(II) nitrate.

What is stoichiometry?

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.In the given reaction , 24.3 g magnesium gives 148.3 g magnesium nitrate thus, 7 g magnesium will give , 7×148.3/24.30=42.72 g

Thus, 42.72 g of precipitate is formed  if we start with 7 g of magnesium metal and 0.5 moles of copper(II) nitrate.

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Related Questions

How many grams are there in 7.40 x 1023 molecules of AgNO3?

Answers

There are 7.40 x 1025 grams of AgNO3 in 7.40 x 1023 molecules of AgNO3.

1 mole of AgNO3 = 169.87 g

Therefore, the total mass of AgNO3 = 7.40 x 1023 x 169.87 g

= 1.25 x 1026 g

What is molecules?

Molecules are the smallest unit of a chemical compound which is composed of two or more atoms of the same or different elements. Molecules can exist in different forms such as solid, liquid, or gas. They are the building blocks of all matter and are responsible for the physical and chemical properties of substances. Molecules also play an important role in biological processes.

Therefore, There are 7.40 x 1025 grams of AgNO3 in 7.40 x 1023 molecules of AgNO3.

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Is a CO2 molecule polar?

Answers

The Carbon dioxide molecule is non-polar because the dipole antennas in the linear form of the molecule cancelled each other out.

How do polar and nonpolar differ?

We refer to something as polar when it has two distinct ends. When a molecule has both positive and negative ends, we refer to it as being polar. We refer to someone as non-polar if they don't. Polar objects can be drawn to or repelled by one another .

Exactly what is polar?

In the field of chemistry, a molecule is defined as being polar if it contains an unbalanced charge on one of its sides. There is a half charge area there. Both ends have a small positive and negative tilt. With an unequal distribution of electrons, they are typically asymmetrical.

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The Carbon dioxide molecule is non-polar because the dipole antennas in the linear form of the molecule cancelled each other out.

How do polar and nonpolar differ?

We refer to something as polar when it has two distinct ends. When a molecule has both positive and negative ends, we refer to it as being polar. We refer to someone as non-polar if they don't. Polar objects can be drawn to or repelled by one another .

Exactly what is polar?

In the field of chemistry, a molecule is defined as being polar if it contains an unbalanced charge on one of its sides. There is a half charge area there. Both ends have a small positive and negative tilt. With an unequal distribution of electrons, they are typically asymmetrical.

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how are atomic radii and ionization energy related

Answers

Ionization energy is a function of atomic radius; the larger the radius, the smaller the amount of energy required to remove the electron from the outermost orbital.

How are the atomic radius and ionization energy related?

As shielding increases going over the PT, atomic radii will increase because the shielding effect is acquired stronger which causes the valence electrons to be less attracted to the nucleus, as the atomic radii increases, ionization energy will decrease because it will not grip as much energy to remove valence.

Ionization energy and atomic number. active from left to right across the periodic table, the ionization energy for an atom increases. We can explain this by the whole nuclear charge of the atom. The more protons in the nucleus, the stronger the appeal of the nucleus to electrons.

So we can conclude that The smaller the radius, the higher the ionization energy. This is because the electrons are being held closer to the protons,

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complete the table below by writing the symbols for the cation and anion that make up each ionic compound. cuf2

Answers

The following are the ions:

As2O3 - As^3+, O^2-

MnS - Mn^2+, S^2-

VCl3 - V^3+, Cl^-

NiF2 - Ni^2+, F^-

What exactly are cation and anion?

An anion is a negative ion, whereas cations are positive ions. Cations and anions make up ionic substances.

Below is a list of the anions and cations found in the ionic compounds in the table;

As2O3 - As^3+, O^2-

MnS - Mn^2+, S^2-

VCl3 - V^3+, Cl^-

NiF2 - Ni^2+, F^-

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Problem 5: In the figure, the point charges are located at the corners of an equilateral triangle 29 cm on a side. Ia Ic Otheexpertta.com u ψ 25% Part (a) Find the magnitude of the electric field in NC at the location of qa, given that qb-11.5 pC and qe--5.8 μ

Answers

Calculating the vector sum of the electric fields generated by distinct point charges allows one to determine the strength of the electric field at a specific location in space.

The force between two point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them, according to Coulomb's Law, which can be utilised to accomplish this. The total electric field at qa can be computed using Coulomb's Law by first calculating the electric field at qa caused by qb and qc, and then adding those fields vectorially.

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how many moles of hcl are there in 75.0 ml of 0.390 m hcl?

Answers

The number of the moles of the HCl are there in the 75.0 mL of the 0.390 M of the HCl is 0.029 mol.

The molarity of the HCl = 0.390 M

The volume of the HCl = 75 mL

The molarity is expressed as follows :

The molarity = moles / volume in L

Where ,

The molarity of HCl = 0.390 M

The volume of HCl = 75 mL = 0.075 L

The moles = molarity × volume in L

The moles = 0.390 × 0.075

The moles = 0.029 mol

Thus, the number of moles of the HCl is 0.029 mol.

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suppose the drag force on a truck is given by the equation: f = c1v 2 c2v where c1 = 4.80 ns2 m2 and c2 = 111.8 n s m . check that this relationship is plausible. do the units work out?

Answers

The units in the equation for the drag force are correct. The units in the equation add up to Newtons (N) since the phrase F is expressed in Newtons (N), the terms c1 and c2 are expressed in s2 m2/N, and the term v is expressed in m/s.

Accordingly, one newton of force is needed to accelerate one kilogramme of mass at a rate of one metre per second squared in the direction of the applied force. The rate of change in velocity per unit of time, or the acceleration of velocity by one metre per second, is referred to as "metre per second squared." The Conférence Générale des Poids et Mesures (CGPM) Resolution 2 established the unit of force in the MKS system of units as the force needed to accelerate 1 kilogramme of mass at a velocity of 1 metre per second squared.

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15. A chemistry teacher provides students with the amount of potassium hydroxide

they need in solution form. The teacher makes the solution by dissolving 42. 1 g

KOH into 3. 0 L of solution. What is the molarity of this solution?

Answers

The molarity of the potassium hydroxide solution is 0.25 mol/L.

Molarity is a measure of concentration that expresses the amount of solute (the substance being dissolved) in a solution in terms of moles. It is defined as the number of moles of solute per liter of solution. Mathematically, molarity is represented as follows:

M = n/V

where,

n = number of moles of solute

V = volume of the solution in liters

To find the molarity of the potassium hydroxide solution, we need to calculate the number of moles of KOH present in the solution and divide that by the volume of the solution.

First, we'll find the number of moles of KOH:

moles = mass / molar mass

moles = 42.1 g / 56.1 g/mol

moles = 0.75 mol

Next, we'll convert the volume of the solution from liters to liters:

Volume = 3.0 L

Finally, we'll divide the number of moles of KOH by the volume of the solution to find the molarity:

Molarity = moles/volume

Molarity = 0.75 mol / 3.0 L

Molarity = 0.25 mol/L

Therefore, the molarity of the potassium hydroxide solution is 0.25 mol/L.

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How many moles of PFs can be produced when 4.53 mol P reacts with 18.63 mol F2? In order to solve this problem, you will also need to write out a balanced chemical reaction to describe the transformation of P and F2 into PF5.
------------------mol

Answers

When the 4.53 mol P will reacts with the 18.63 mol F₂, The number of the moles of the PF₅ is 4.53 mol.

The balanced chemical equation is as follows :

2P + 5F₂    →    2PF₅

The number of the moles = mass / molar mass

The moles of the P = 4.53 mol

The moles of the F₂ = 18.63 mol

It is clear from the balanced chemical equation is as :

1 mole of P  produce 2 mole of PF₅

The moles of the PF₅ = (2/2 ) × 4.53 mol

The moles of the PF₅ = 4.53 mol= (2/2 ) × 4.53 mol

The moles of the PF₅ = 4.53 mol

Thus, the mole of PF₅ = 4.35 mol

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Write the net chemical equation for the production of acrylic acid from calcium carbide, water and carbon dioxide. Be sure your equation is balanced.

Answers

The net chemical equation for the production of acrylic acid from calcium carbide, water and carbon dioxide is 6C₂H₂(g) + 16H₂O(g) + 3CO₂(g) ⇒ 6Ca(OH)₂(s) +  5CH₂CHCO₂H(g)

You must write out the two chemical equations and then add the elements or compounds on either side to obtain the net chemical equation. then eliminate the ones on each side.

Following is the first step of the reaction, which involves the reaction of calcium carbide with water to produce acetylene and calcium hydroxide:

6CaC₂(s) + 12H₂O(g) ⇒ 6C₂H₂(g) + 6Ca(OH)₂(s)

Acetylene, carbon dioxide, and water combine to generate acrylic acid in the second phase, which goes like this:

6C₂H₂(g) + 4H₂O(g) + 3CO₂(g) ⇒ 5CH₂CHCO₂H(g)

The overall reaction equation will be;

6C₂H₂(g) + 16H₂O(g) + 3CO₂(g) ⇒ 6Ca(OH)₂(s) +  5CH₂CHCO₂H(g) is the net chemical equation.

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isonitriles (a) are an important clss of compounds

Answers

The family of compounds known as isonitriles, or cyanamides, is distinguished by the presence of a nitrogen atom bound to a carbon atom and a cyano group (-CN) on the nitrogen.

They contain the chemical formula R-NC and are regarded as a significant class of compounds because of their distinctive characteristics and diverse range of uses. Isonitriles are helpful in the synthesis of several chemicals because of their great thermal stability, low reactivity, and insoluble nature in the majority of solvents. Additionally, they serve as ligands in coordination chemistry and as intermediates in the production of organic compounds. Isonitriles are employed in the production of several medications, therefore they have a significant impact on the pharmaceutical sector as well. Due to their distinct characteristics and wide range of uses in industries including chemistry, pharmacology, and materials research, isonitriles are a significant family of substances.

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Why do you extract the styrene with NaOH?

Answers

To get rid of any impurities and inhibitors of polymerization.

Describe styrene?

The petroleum products that are used to generate these items are the main source of Styrene after fractional distillation to remove the olefins and aromatics necessary for the chemical components to produce Styrene, which is a translucent organic liquid hydrocarbon. Styrene, likewise referred to as High Impact Expandable plastic polystyrene is a cheap, lightweight, and convenient material to transport. Plastics, polyesters, latex paints and coatings, synthetic rubber, and styrene-alkyd coatings are the main applications for styrene. These materials have several uses in the construction, packaging, automotive, and home goods industries.High levels of styrene in the air can disrupt your ability to see colour, make you feel fatigued or inebriated, slow down your reaction time, make you lose focus, and affect your balance. Extremely high styrene concentrations resulted in animals exhibiting hearing loss. Workers who are exposed to styrene risk health problems. Prior to usage, styrene was purified using extractions with a 5 weight percent aqueous solution of sodium hydroxide (NaOH) to get rid of any impurities and polymerization inhibitors, and then with distilled water to get rid of any NaOH that was still present. Drying with anhydrous Na2SO4 was then done.

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Sodium hydroxide (NaOH) is used to extract styrene from aqueous solutions because it acts as a base, which reacts with the acidic styrene molecules to form sodium styrenate, which is soluble in water. This allows for the styrene to be easily separated and removed from the solution.

What is styrene?

The petroleum products that are used to generate these items are the main source of Styrene after fractional distillation to remove the olefins and aromatics necessary for the chemical components to produce Styrene, which is a translucent organic liquid hydrocarbon. Styrene, likewise referred to as High Impact Expandable plastic polystyrene is a cheap, lightweight, and convenient material to transport. Plastics, polyesters, latex paints and coatings, synthetic rubber, and styrene-alkyd coatings are the main applications for styrene.

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Identify the copolymer? a.polyethylene b.polyvinyl chloride
c.polypropylene
d.polystyrene
e.nylon 6,6

Answers

Among the given options of the question option e. Nylon 6,6 is a copolymer.

What is Nylon 6,6?

Nylon 6,6 is a copolymer made from two monomers, hexamethylene diamine and adipic acid. It is a thermoplastic polymer with a high strength-to-weight ratio and excellent durability, making it suitable for a variety of applications including fibers for clothing, machinery parts, and automotive applications. Nylon 6,6 is also resistant to abrasion, solvents, and UV light, which adds to its versatility in different environments and conditions.

Copolymers are polymers formed from two or more different monomers. They have properties that are a combination of the properties of the individual monomers. Copolymers have a wide range of applications, including in the fields of materials science, medicine, and the environment.

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how many grams of a sample of n2 contains a total of 3.0 × 1023 molecules?

Answers

he mass of 3.0 x 10²³ molecules of nitrogen gas is 13.95 g. It can be calculated by using molecules formula.

Mass of the Nitrogen gas

The mass of one mole of Nitrogen gas is 28 g/mol.

Number of atoms

The number of atoms in one mole of Nitrogen gas is 6.022 x 10²³ molecules.

The mass of Nitrogen gas in the given number of molecules is calculated as follows;

6.022 x 10²³  =  28 g/mol

3.0 x 10²³ =  x

x= ....?

3.0 . 10²³ . 28 = 6.022 x 10²³  . x

x = [tex]\frac{3.0 . 10^{23} . 28}{6.022 . 10^{23} }[/tex]

x = 13.95

Thus, the mass of 3.0 x 10²³ molecules of nitrogen gas is 13.95 g.

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based on the brønsted-lowry theory of acids and bases, which of the following species can act as both a conjugate acid and a conjugate base?

Answers

Since water is amphoteric, it can function as both a Brnsted-Lowry acid and a base. In aqueous solution, strong acids and bases totally ionize, whereas weak acids and bases only partially do so.

What is the brønsted-lowry theory of acids and bases?

The acid-base theory of Bronsted-Lowry. The base is a substance that takes a H + ion or a proton to generate its conjugate acid, and the acid is The Bronsted-Lowry theory states that a chemical transfers a proton or a H + ion to create its conjugate base.

The species created after an acid donates a proton is known as the conjugate base of a Brnsted-Lowry acid.

Therefore, A material known as the Brønsted-Lowry base is one that may take up a proton or H+ ion from other substances. A base reforms when a conjugated acid donates a proton.

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Since water is amphoteric, it can function as both a Brnsted-Lowry acid and a base. In aqueous solution, strong acids and bases totally ionize, whereas weak acids and bases only partially do so.

What is the brønsted-lowry theory of acids and bases?

The acid-base theory of Bronsted-Lowry. The base is a substance that takes a H + ion or a proton to generate its conjugate acid, and the acid is The Bronsted-Lowry theory states that a chemical transfers a proton or a H + ion to create its conjugate base.

The species created after an acid donates a proton is known as the conjugate base of a Brnsted-Lowry acid.

Therefore, A material known as the Brønsted-Lowry base is one that may take up a proton or H+ ion from other substances. A base reforms when a conjugated acid donates a proton.

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the initial concentration of a monoprotic weak acid solution (pka = 4.2) which has a ph of 3.4 is:

Answers

The initial concentration of the monoprotic weak acid solution (pka = 4.2) ` has a pH value of 3.4 is : 0.0025 M.

The pH value = 3.4

The pka value = 4.2

The monoprotic acid is given as follows :

HA   ---->   H⁺  +  A⁻

The pH expression is given as :w

pH = 1/ 2 [ pka - loga]

where,

pka = 4.2

pH = 3.4

3.4 = 1/2 [ 4.2 - loga]

6.8 = 4.2 - log a
2.6 = - log a

a =  10^-2.6

a = 0.0025 M

The initial concentration of a monotropic acid is 0.0025 M.

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thorium-234 has a half-life of 24 days. how much would remain after 72 days if you started with 100 grams?

Answers

Thorium-234 has a half-life of 24 days. There would be 12.5 gram remain after 72 days if you started with 100 grams.

Consider a nuclear half-life, or the amount of time required for a radioactive substance's initial sample to decay by half.

You are aware that the half-life of thorium-234 in your situation is 24 days. This implies that half of the thorium atoms in your sample will decay every 24 days.

Naturally, this correlates to saying that after 24 days, just half of the thorium atoms in your sample will remain.

A=A₀⋅1/2ⁿ, where

A₀ is the initial mass of the sample

n is the number of half-lives that pass in a given period of time.

In your case, you'd have 72 days

n = 72/ 24 = 3

so

A=A₀⋅1/2ⁿ

A =   100 grams. 1/2³

A = 12.5 gram

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Butene has a molecular formula of C4H8
. What is the empirical formula of this compound?

Answers

The empirical formula of butene is CH2 because there is a 1:2 ratio of carbon atoms to hydrogen atoms.

The empirical formula of a compound is the simplest whole number ratio of its constituent elements. It represents the smallest whole number ratio of atoms in the compound.

The empirical formula can be determined by analyzing the composition of the compound, either through chemical analysis or through spectroscopy. It is an important piece of information that can be used to determine the molecular formula or to understand the basic structure and composition of a compound.

To find the empirical formula of a compound, we first need to determine the number of atoms of each element present in the compound. For butene (C4H8), the molecular formula indicates that there are 4 carbon atoms and 8 hydrogen atoms present.

Therefore, The empirical formula of butene is CH2 because there is a 1:2 ratio of carbon atoms to hydrogen atoms.

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What can make Fermi doublets difficult to identify? One peak is larger than the other and overlaps it The two peaks are always small One peak overlaps with sp3 C-H peaks One peak overlaps with sp
C−H
peaks

Answers

Fermi doublets becomes  difficult to identify when one peak overlaps with sp3 C-H peaks or sp2 C-H peaks.

What is Fermi resonance?

Fermi resonance appears when a fundamental vibration frequency lies closely to an overtone or combination frequencies.

We know that in NMR spectroscopy, Fermi doublets arise from coupling between a nucleus and its neighboring nuclei, and they appear as two closely spaced peaks in the spectrum.

But in most cases, if the peaks are small, they may not be easily differentiated most especially when they overlap with peaks from other nuclei, such as sp3 C-H or sp2 C-H peaks making  it difficult to accurately identify and interpret the Fermi doublet in the NMR spectrum.

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you need 455 ml of a 80% alcohol solution. on hand, you have 50% alcohol mixture. you also have 85% alcohol mixture. how much of each mixture will you need to add to obtain the desired solution?

Answers

Let's call the volume of the 50% alcohol mixture used x and the volume of the 85% alcohol mixture used y. We know that the total volume of the solution must be 455 ml, so:

x + y = 455 ml

To find the amount of alcohol in each mixture, we need to multiply the volume of each mixture by its concentration.

For the 50% alcohol mixture:

0.50 * x = 0.80 * (x + y) * 0.5 -------(1)

And for the 85% alcohol mixture:

0.85 * y = 0.80 * (x + y) * 0.55 -----(2)

We can substitute the second (2) into the (1):

0.50 * x = 0.80 * (x + y) * 0.5

0.50 * x = 0.80 * (x + y) * 0.5

0.50 * x = 0.44 * (x + y)

Finally, we can solve for x and y by dividing both sides of the equation by 0.44:

x = (0.50 * x) / 0.44

x = (0.50 * x) / 0.44

x = 227.27 ml

And then, we can find y by using the  equation (1):

y = 455 ml - x

y = 455 ml - 227.27 ml

y = 227.73 ml

So, we need 227.27 ml of the 50% alcohol mixture and 227.73 ml of the 85% alcohol mixture to obtain the desired 80% alcohol solution.

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What causes jet streams to form?

Answers

Answer:

Jet streams form when warm air masses meet cold air masses in the atmosphere. The Sun doesn't heat the whole Earth evenly. That's why areas near the equator are hot and areas near the poles are cold

sulfuryl chloride decomposes when heated in an experiment, the initial concentration

Answers

The concentration of sulfuryl chloride after 4.5 hours.  The reaction is first order . The concentration ,[SO₂Cl₂] = 0.017 M.

The chemical reaction is as follows :

SO₂Cl₂(g)  ---->  SO₂(g)  + Cl₂(g)

Rate = k [SO₂Cl₂]

k = 2.2  × 10⁻⁵ s⁻¹

The integrated law is as follows :

[SO₂Cl₂] = [SO₂Cl₂] e^-kt

The initial concentration  = 0.0248 M

The reaction time is 4.5 hours. the molarity after the time 4.5 hours is :

[SO₂Cl₂]  = ( 0.0248 M) e ^(2.2  × 10⁻⁵ s⁻¹ × 16200 s)

[SO₂Cl₂]  = 0.017 M

Thus, the concentration after the time 4.5 hours is 0.017 M.

This question is incomplete, the complete question is :

Sulfuryl chloride decomposes when heated.

SO₂Cl₂(g)  ---->  SO₂(g)  + Cl₂(g)

In an experiment, the initial concentration of sulfuryl chloride was 0.0248 mol/L. If the rate constant is 2.2 × 10⁻⁵ s⁻¹, what is the concentration of sulfuryl chloride after 4.5 hours? The reaction is first order.

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6. Determine the temperature, salinity, and density of ocean water at the following locations
a. 15°N, 60°E
b. 15°N, 110°W
Temperature-
Temperature-

Salinity-
Density-
Salinity-
Density-

Why do you think the salinity is similar in both areas?

Answers

Answer:

I'm sorry, I cannot provide exact temperature, salinity, or density values for specific ocean locations without further information. The values of these properties can vary greatly depending on many factors such as water depth, water circulation patterns, and local weather conditions. It is also worth noting that ocean temperature, salinity, and density can change over time and can fluctuate on a daily or seasonal basis.

Regarding the similarity in salinity in both areas, ocean salinity is primarily controlled by the balance between the input of freshwater from precipitation, rivers, and glaciers, and the output of salt through processes such as evaporation and the formation of sea ice. The similarity in salinity between two locations could be due to the presence of similar sources of freshwater or similar ocean circulation patterns that mix water from different sources and distribute salt and other dissolved substances evenly across the ocean. However, it is also possible that the salinity could be different due to other factors such as differences in ocean currents, water mixing, or local weather patterns.

Calculate the percent by mass of water in BaCl2.5H2O
6.0%
8.6%
30.0%
70.0%

Answers

The percent by mass of water in BaCl2.5H2O is approximately43.22%.

What is percent mass?

Mass of the element or solute divided by the mass of the compound or solute is called mass percent . The result is then multiplied by 100 to give a percent.

To calculate the percent by mass of water, you would need to find the mass of water in the formula and divide it by the total mass of the formula and multiply by 100.

BaCl2.5H2O formula weight = 208.23 g/mol

Mass of water (5 x 18.02 g/mol) = 90.1 g

Percent by mass of water = (90.1 g / 208.23 g) x 100 = 43.22%.

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How is the law of mass action related to equilibrium?

Answers

The ratio of the equilibrium concentrations of the products to the concentrations of the reactants raised to their respective powers to the coefficients in the equilibrium equation is K in law of mass action.

Is the equilibrium law the same as the law of mass action?

To use a typical chemical reaction equation in which reactants A and B react to yield products C and D, we introduce the mass action law. The chemical species' concentrations are denoted by the square brackets "[]" around them. This is the ideal law of mass action or chemical equilibrium.

What is related to the law of mass action?

The Law of Mass Action states that when a chemical reaction reaches the optimum, the concentrations of the chemicals involved bear a constant relation to each other, which is explained by an equilibrium constant, and that the speed of a reaction varies depending on the molecular concentrations of the reactants.

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what is the charge of the common ion formed by each of these atoms?

Answers

Sulfur (S): -2, Bromine (Br): -1, Iodine (I): -1, Lithium (Li): +1, Strontium (Sr): +2, Magnesium (Mg): +2, Sodium (Na): +1, Cesium (Cs): +1, Barium (Ba): +2, Fluorine (F): -1, Oxygen (O): -2.

Charges are based on gaining or losing electrons to achieve stable electron configurations.

We have,

To determine the charge of the common ion formed by each of these atoms, you need to consider their position on the periodic table and their tendency to gain or lose electrons to achieve a stable electron configuration.

Sulfur (S): -2 (gains 2 electrons to form S²⁻)

Bromine (Br): -1 (gains 1 electron to form Br⁻)

Iodine (I): -1 (gains 1 electron to form I⁻)

Lithium (Li): +1 (loses 1 electron to form Li⁺)

Strontium (Sr): +2 (loses 2 electrons to form Sr²⁺)

Magnesium (Mg): +2 (loses 2 electrons to form Mg²⁺)

Sodium (Na): +1 (loses 1 electron to form Na⁺)

Cesium (Cs): +1 (loses 1 electron to form Cs⁺)

Barium (Ba): +2 (loses 2 electrons to form Ba²⁺)

Fluorine (F): -1 (gains 1 electron to form F⁻)

Oxygen (O): -2 (gains 2 electrons to form O²⁻)

Charges are determined based on the number of valence electrons and the tendency to gain or lose electrons to achieve a full valence electron shell. Metals tend to lose electrons to form positive ions (cations), while non-metals tend to gain electrons to form negative ions (anions).

Thus,

Sulfur (S): -2, Bromine (Br): -1, Iodine (I): -1, Lithium (Li): +1, Strontium (Sr): +2, Magnesium (Mg): +2, Sodium (Na): +1, Cesium (Cs): +1, Barium (Ba): +2, Fluorine (F): -1, Oxygen (O): -2.

Charges are based on gaining or losing electrons to achieve stable electron configurations.

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The complete question:

What is the charge of the common ion formed by each of these atoms? Either -2,-1,+1, or +2.

S, Br, I, Li, Sr, Mg, Na, Cs, Ba, F, and O

How are these changes found?

When 3,3-dimethylbut-1-ene is treated with HBr alone, the major product is 2-bromo-2,3-dimethylbutane. When the same alkene is treated with HBr and peroxide, the sole product is 1-bromo-3,3-dimethylbutane. Explain these results by referring to the mechanisms?

Answers

When 3,3-dimethylbut-1-ene is treated with HBr alone, the major product is 2-bromo-2,3-dimethylbutane :

H₃C = CH - C(CH₃)₂ - CH₃ + HBr  ----->  H₃C - C(CH₃) - CH(CH₃) - CH₃

                                                                          |

                                                                         Br

The reaction in which addition of HBr to the 3,3-dimethylbut-1-ene will takes place according to the markonikov rule.

H₃C = CH - C(CH₃)₂ - CH₃ + HBr  ----->  H₃C - C(CH₃) - CH(CH₃) - CH₃

                                                                          |

                                                                         Br

                                                                         2-bromo-2,3-dimethylbutane

When the same in addition of the HBr in the presence of the peroxide will form thew product  1-bromo-3,3-dimethylbutane.

H₃C = C(CH₃) - C(CH₃)₂ - CH₃   ------ >   H₂C - CH₂ - C(CH₃)₂ - CH₃

                                                                     |

                                                                     Br

                                                                                                                         

                                                                         

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a sample of a gas occupies 250. ml at 1.00 atm of pressure. if the pressure increases to 2.00 atm while the temperature stays the same, what is the new volume?

Answers

The new volume is 500. ml.

The relationship between pressure, volume and temperature for a gas at a constant number of moles is given by the Ideal Gas Law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant and T is the temperature in Kelvin.

Since the number of moles is constant, we can rearrange the Ideal Gas Law to isolate the volume:

V = nRT / P

Plugging in the known values:

V = nRT / P

V = nRT / 2.00 atm

V = (nRT) / (2.00 atm)

V = 250. ml * 2.00 atm / 1.00 atm

The new volume is 500. ml.

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Methylamine (CH3NH2) is a weak base with a Kb = 4.38 x 10-4. What is the pH of a 0.037 M solution of methylamine?

Answers

The pH of a 0.037 M solution of methylamine is 4.97.

The Kb value and the amount of methylamine present in the solution can be used to calculate the pH of a methylamine solution. As a weak base, methylamine interacts with water to produce the ions methylammonium (CH3NH3+) and hydroxide (OH) (OH-). The concentration of the hydroxide ion in solution can be determined using the equilibrium constant for this reaction, Kb:

Kb = [CH3NH3+] × [OH-] / [CH3NH2]

Since the concentration of methylamine is known, the concentration of the hydroxide ion can be calculated:

Kb = [OH-[tex]]^{2}[/tex] / [CH3NH2]

[OH-] = sqrt(Kb × [CH3NH2]) = sqrt(4.38 x [tex]10^{-4}[/tex] × 0.037) = 1.07 x [tex]10^{-5}[/tex] M

The pH of the solution can be calculated using the concentration of the hydroxide ion:

pH = -log([OH-]) = -log(1.07 x [tex]10^{-5}[/tex]) = 4.97

So, the pH of a 0.037 M solution of methylamine is 4.97.

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a 1 l reaction vessel is charged with 1.0 mole of n2 and 1.0 moles of h2 (reactants only, no nh3) and allowed to run until it achieves equilibrium at 600 k. a. what are the concentrations of [n2], [h2], and [nh3] at equilibrium? b. using these concentrations, calculate the value of keq at this temperature. how does this result compare to the value of keq given by the application?

Answers

The result compare to the value of keq given by the application as 1.33.

What is equilibrium?

Equilibrium is a state in a system where the rates of opposing processes are equal, resulting in no net change in the system over time. It is a state of balance between opposing forces or processes, where the system is in a stable, unchanging condition.

At equilibrium, the concentrations of N2, H2, and NH3 can be calculated using the equilibrium constant expression for the reaction:

The value of the equilibrium constant, Kc, can be calculated using the concentrations of the species at equilibrium, [N2], [H2], and [NH3].

Since the initial concentration of N2 and H2 is 1.0 mole each, the initial concentration of N2 can be assumed to be [N2] = 1.0 M, and the initial concentration of H2 can be assumed to be [H2] = 1.0 M. At equilibrium, the concentration of NH3 can be calculated using the expression for Kc and the initial concentrations of N2 and H2.

                                          N₂ + 3H₂ ⇒ 2NH₃

                                           1          1           0

Moles are equilibrium:     1/3         1         2/3

Total volume = 1L

Concentration at Eqm:

N₂ = 1/3 mol/l

H₂ = 1mol/l

NH₃ = 2/3 mol/l

[tex]$ K_{eq} = \frac{[NH_3]^2}{[N_2][H_2]^3}[/tex]

[tex]$ K_{eq} = \frac{[2/3]^2}{[1]^3[1/3]}[/tex]

[tex]$ K_{eq} = \frac{4}{3}[/tex]

[tex]$ K_{eq} = 1.33[/tex]

The result compare to the value of keq given by the application as 1.33.

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