The number of moles of water that vaporized during the first five minutes would be 2.78 moles (50 g / 18 g/mol = 2.78 moles).
What is moles?Moles are a kind of small mammal found in many parts of the world. They are burrowing animals, living underground in burrows and tunnels. They have adapted to life underground and have physical features that help them survive in this environment, such as small eyes and ears, short legs and strong claws. They feed mainly on grubs, worms, and other small invertebrates found underground. They also eat some plant material and occasionally small animals. Moles are solitary animals and live in small family groups. They play an important role in the ecosystem, aerating and fertilizing the soil.
In order to calculate the number of moles of water that vaporized during the first five minutes, we must first calculate the mass of water vaporized during the same time period. This can be done by subtracting the mass of water remaining in the beaker after five minutes from the initial mass of water in the beaker. Once the mass of water vaporized is determined, it can then be converted to moles using the equation mass (g) = moles x molar mass (g/mol).
Assuming the initial mass of water in the beaker was 100 g, and the mass of water remaining in the beaker after five minutes was 50 g, the mass of water vaporized during this time period would be 50 g. To convert this to moles, we would use the equation mass (g) = moles x molar mass (g/mol). Since the molar mass of water is 18 g/mol, the number of moles of water that vaporized during the first five minutes would be 2.78 moles (50 g / 18 g/mol = 2.78 moles).
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make a list of what factors you think affect solubility.
In light of this, the elements influencing solubility depend on the solute's state water is considered as a pure substance because, with a few exceptions, it can dissolve essentially all soluble compounds. The mobility of a chemical can be influenced by a number of circumstances. The creation of a new bond between the molecules of the solute and the solvent is termed as solubility.
A substance's chemical and physical properties determine how soluble it is. A few other factors and situations can also impact it. A few of them are: temperature, pressure, type of binding, and forces here between components.
On the other hand, if this thermal decomposition turns out to be exothermic, solubility drops. If a solution must be used to breakdown hydrocarbons as little more than a solute.
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Select all paramagnetic species.
Group of answer choices:
- atomic sodium
- iron(III) ion
- fluoride ion
- calcium(II) ion
- zinc(II)
Paramagnetic species are fluorine , calcium , iron(III) ion . Atomic sodium and zinc(II) are diamagnetic species.
Elaborating :Compounds that are paramagnetic always have one or more unpaired electrons that are drawn to the magnetic poles.
Because one of the remaining p orbitals of fluorine contains an unpaired electron, the element is paramagnetic in this case.
Sodium is diamagnetic, and Zn(II) is diamagnetic because it has all paired electrons. Calcium(II) is assumed to be paramagnetic because it excites one electron from its s-orbital to its exctied d-orbital. Iron(III) is paramagnetic because it needs unpaired electrons.
How does paramagnetic work?Substances with impaired electrons that are attracted by a magnetic field are called paramagnetic. In the absence of a magnetic field, they lose their magnetism. The substance's magnetic moment and, consequently, its paramagnetism increase with the number of unpaired electrons.
Why is it referred to as paramagnetic?The majority of atoms with incompletely filled atomic orbitals are paramagnetic, with the exception of copper, due to the presence of unpaired electrons in the material. Unpaired electrons have a magnetic dipole moment and behave like tiny magnets because of their spin.
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count the total number of sigma bonds and pi bonds in the compound below
Covalent bonds are one of the most important types of chemical bonds formed by the overlapping of an element's atomic orbitals. Because of this overlapping, a very strong bond is formed, and covalent bonds are the strongest known bonds.
A molecule can contain both sigma bonds and pi bonds.
A single bond in a covalent bond is always a sigma bond.
A double bond consists of a sigma bond and a pi bond, whereas a triple bond consists of two pi bonds.
When we look at the molecule, we can see that it has 14 single bonds, 1 double bond, and 1 triple bond.
As a result, the molecule has 16 sigma bonds.
(14+1+1)
The total number of pi bonds 3(1+2).
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the density of silver is 10.5 g/ml. what mass of silver (in mg) has a volume of 15 ml?
Answer:
157,500mg
Explanation:
Mass = density × volume
= 10.5 g/ml × 15 ml
= 157.5 g
Since the answer is asked in mg we will have to convert 157.5 g to mg:
157.5 × 1000 = 157, 500mg
The mass of silver with a volume of 15 ml can be calculated as follows:
mass = density × volume mass = 10.5 g/ml ×15 ml mass = 157.5 g
Since 1 g = 1000 mg, then 157.5 g = 157.5 × 1000 mg = 157,500 mg.
So, the mass of silver with a volume of 15 ml is 157,500 mg.
Silver is a dense metal with a high melting and boiling point, which is something to keep in mind. It is an important material in numerous industries, including electronics, jewellery, and coinage due to its excellent electrical and thermal conductivity. Because of its antibacterial qualities and because of its particular shine and malleability, it is also widely employed in the arts and in the medical area. Although silver's density is largely constant, conditions like temperature and purity can have an impact. The ability to calculate a substance's volume and mass using its density is another useful attribute that is significant in disciplines like materials science and engineering.
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If 15.0g of N₂O4 was produced, how many moles of O2 were required?
The number of mole of O₂ required for the reaction if 15.0 grams of N₂O4 is produced, is 0.326 mole
How do I determine the mole of O₂ required?We'll begin by obtaining the number of mole in 15.0 g of N₂O₄. Details below:
Mass of N₂O₄ = 15 gMolar mass of N₂O₄ = 92 g/molMole of N₂O₄ =?Mole = mass / molar mass
Mole of N₂O₄ = 15 / 92
Mole of N₂O₄ = 0.163 mole
Next, we shall write the balanced equation for the reaction. This is givrn below:
N₂ + 2O₂ -> N₂O₄
From the balanced equation above,
1 mole of N₂O₄ was produced from 2 moles of O₂
Finally, we shall determine the number of mole O₂ required for the reaction. Details below:
From the balanced equation above,
1 mole of N₂O₄ was produced from 2 moles of O₂
Therefore,
0.163 moles of N₂O₄ will be produced from = 0.163 × 2 = 0.326 mole of O₂
Thus, number of mole of O₂ required is 0.326 mole
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how many molecules of oxygen are needed to react with 98.6 g so2? 2so2 o2  2so3
4.63 x 10²³ molecules of Oxygen are needed to react with 98.6 g of SO₂ (sulfur dioxide).
Given:
The mass of SO₂ = 98.6 g
The calculation for the molar mass of sulfur dioxide is:
Sulfur (S) = 32.07 g/mol
Oxygen (O) = 2 × 16.00 g/mol
= 32.00 g/mol
Total molar mass of SO₂:
= 32.07 + 32.00
= 64.07 g/mol
Number of moles of SO₂ = Mass of SO₂ / Molar mass of SO₂
Number of moles of SO₂ = 98.6 g / 64.07 g/mol
= 1.53 moles
Use the stoichiometry of the balanced chemical equation to determine the ratio of oxygen to sulfur dioxide.
From the balanced equation: 2SO₂ + O₂ → 2SO₃
The ratio of O₂ to SO₂ is 1:2.
The ratio of O₂ to SO₂ is 1:2, and the number of moles of O₂ is half the number of moles of SO₂.
Number of moles of O₂ = 1/2 × Number of moles of SO₂
Avogadro's number states that 1 mole of any substance contains 6.022 x 10²³ molecules.
Number of molecules of O₂ = Number of moles of O₂ × Avogadro's number
Number of moles of SO₂ = 98.6 g / 64.07 g/mol
= 1.539 mol
Number of moles of O = 1/2 × 1.539 mol
= 0.7695 mol
Number of molecules of O₂ = 0.7695 mol × (6.022 x 10^23 molecules/mol) = 4.63 x 10²³ molecules
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how is the beginning and end of a range of a boiling point defined?
The beginning of a boiling point is the temperature at which a substance boils under standard conditions of 1 atm pressure and the end of a range of a boiling point is the temperature above which a substance can no longer be liquefied.
The range of a boiling point refers to the difference between the lowest and highest boiling point of a substance. The boiling point of a substance is defined as the temperature at which its vapour pressure is equal to atmospheric pressure and it changes from a liquid to a gas. The normal boiling point is usually used as a reference point to compare the boiling points of different substances.
On the other hand, the end of a boiling point range is defined as the “critical temperature” which is the temperature above which a substance can no longer be liquefied no matter how much pressure is applied. At this temperature, the vapour pressure of the substance is equal to its critical pressure, and it becomes a supercritical fluid.
It's essential to understand that the boiling point range is not a fixed value and can vary based on the pressure and temperature of the surrounding environment. In addition, some substances have a wide boiling point range, while others have a narrow range.
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What is the mass of potassium nitrate that is produced when 2.04 moles of potassium phosphate react?
As per the balanced reaction, one mole or 212.7 g of potassium phosphate gives 3 moles or 303.3 g of potassium nitrate. Then, 2.04 moles or 433 g of potassium phosphate is 619.1 g.
What is potassium nitrate ?Potassium nitrate is an ionic compound formed by donating electrons from the potassium metal to the nitrate group.
As per the given reaction, 1 mole of potassium phosphate gives 3 moles of potassium nitrate.
molar mass of potassium phosphate = 212. 2 g
molar mass of potassium nitrate = 101.1 g
mass of 3 moles of potassium nitrate = 303.3 g.
Mass of 2.4 moles of potassium phosphate = 2.4 ×212. 2 g = 433.3 g.
Then, the mass of potassium nitrate formed by 433.3 g of potassium phosphate is :
(433.3 g× 303.3 g)/212.7 g = 619.1 g
Therefore, the mass of potassium nitrate is 619.1 g.
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Your question is incomplete. But your complete question is:
K3PO4 + Al(NO3)3 → 3KNO3 + AlPO4
a. What is the mass of potassium nitrate that is produced when 2.04 moles of potassium phosphate react?
What is the dominant charge on the side group of Leu at pH = 7? (Report your answer as -1,0, or 1)
The dominant charge on the side group of Leu (Leucine) at pH = 7 would be neutral, or 0.
This is because Leucine has a neutral side group at this pH. The charge of amino acid side groups can change with changes in pH, but at a pH of 7, the side group of Leucine would be neutral.
The dominant charge on the side group of a protein depends on the pH, which refers to the level of acidity or basicity of a solution. At a pH of 7, which is considered neutral, the amino acid Leucine will have a neutral charge. This means that there will be an equal number of positively charged and negatively charged particles in the side group of Leucine, resulting in a dominant charge of 0. In general, the dominant charge on the side group of a protein can vary based on the pH, temperature, and other environmental factors.
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An empty volumetric flask weights 74.85 grams. After 25.0 mL of a liquid is added, the flask and liquid weigh 111.50 g. What is the density of the liquid?
Density of liquid is calculated to be equal to 1466 kg/m^3.
What is density?Density is the mass per unit of volume of substance and the symbol for density is ρ .
Mass of liquid = 111.50 g - 74.85 g = 36.65 g
Convert the volume of the liquid from milliliters to cubic meters. We can do this by using the conversion factor of 1 mL = 10^-6 m^3:
volume of liquid = 25.0 mL x 10^-6 m^3/mL = 2.50 x 10^-5 m^3
Density of liquid = mass of liquid / volume of liquid = 36.65 g / (2.50 x 10^-5 m^3)
= 1466 kg/m^3
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Consider the following elementary gas-phase reversible reaction to be carried out isothermally with no pressure drop and for an equal molar feed of A and B with CA0 = 2. 0 mol/dm3. (a) What is the concentration of B initially? CB0 = _______ (mol/dm3)(b) What is the limiting reactant? _______(c) What is the exit concentration of B when the conversion of A is 25%? CB = ______ (mol/dm3)(d) Write –rA solely as a function of conversion (i. E. , evaluating all symbols) when the reaction is an elementary, reversible, gas-phase, isothermal reaction with no pressure drop with an equal molar feed and with CA0 = 2. 0 mol/dm3, kA = 2dm6/mol2·s, and KC = 0. 5 all in proper units –rA = _______. (e) What is the equilibrium conversion?(f) What is the rate when the conversion is:(1) 0%?(2) 50%?(3) 0. 99 Xe?
Considering the following elementary gas-phase reversible reaction to be carried out isothermally with no pressure drop,
The concentration of B initially, CB0 is 1.0 mol/dm3The limiting reactant is CThe exit concentration of B when the conversion of A is 25% CB = 12.5%The value of –rA solely as a function of conversion (i. E. , evaluating all symbols) when the reaction is an elementary, reversible, gas-phase, isothermal reaction with no pressure drop with an equal molar feed is –rA = CA0 /kA + kC = 2 /2.5 = 0.8The equilibrium conversion is given by r = kA*CA - kC*CC = 2*2-1*2.5=1.5The rate when the conversion is :1) 0% = 0
2) 50%= 0.5
3) 0.99Xe= 99%
When a chemical reaction is reversible, the reactants and products both react to create the final product at the same time.
Such a reaction involves constant forward and backward reactions between the reactants and products.
Simply said, when molecules collide, reactant bonds are disrupted, and the energy released from this broken connection is used to create new product molecules.
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group theoretical yield actual yield a 5.10 g 5.01 g b 4.99 g 4.38 g c 5.05 g 5.07 g
what is the percent yield of silver hydroxide based on group a’s results?
a) 9.00% b) 102.0% c) 98.2% d) 48.2%
Percent yield of silver hydroxide based on group a's results = 98.2%
Percent yield is calculated by dividing the actual yield of a reaction by the theoretical yield and multiplying the result by 100. The theoretical yield is the expected amount of product that should be obtained based on the stoichiometry of the reaction.
In group a, the theoretical yield of silver hydroxide is 5.10 g and the actual yield is 5.01 g. The percent yield can be calculated as follows:
Percent yield = (Actual yield / Theoretical yield) x 100 = (5.01 / 5.10) x 100 = 98.2%
Hence, the percent yield of silver hydroxide based on group a's results is 98.2%.
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gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 1.50 g of ethane is mixed with 8.6 g of oxygen. calculate the maximum mass of water that could be produced by the chemical reaction. round your answer to significant digits.
The maximum amount of water is only 38 g H2O because C2H6 is the limiting reactant and the amount of water in C2H6 is lower (2 significant digits)
According to the reaction equation; 2CO2(g) + 3H2O = C2H6(g) + 7/2O2(g) (g). Next, we change the provided reactant masses to reactant moles. The number of moles = mass/molar mass = 7.82g/30gmol-1 = 0.261 moles for ethane. The number of moles = 9.9 g/32 gmol-1 = 0.31 moles for oxygen The limiting reactant, which produces the least quantity of product, is what we identify next. As for ethane; 0.261 moles of Ethane produce 0.261 3 = 0.783 moles of water, according to the reaction equation. for oxygen. 3 moles of water are produced by 3.5 moles of oxygen. 0.31/3/3.5 = 0.266 moles of water are produced from 0.31 moles of oxygen. So, the limiting reactant is oxygen. Water produced as a mass equals 0.266 moles of water times 18 gmol-1, or 4.79 g of water. Ethane produces 3 moles of water from 1 mole.
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Investigators have found black and smokeless powder at the scene of a crime involving a fire. What is the BEST way for the investigators to analyze this
evidence?
A. by asking a dog to sniff it
B.
C.
D.
by using an ion mobility spectrometer (IMS)
by looking under a microscope
by washing it with acetone
These are some examples of traditional forensic analysis techniques:Hair and fiber analysis, spectroscopy, serology, and chromatography.
What techniques are utilized for evidence analysis? These are some examples of traditional forensic analysis techniques:Hair and fiber analysis, spectroscopy, serology, and chromatography (such as DNA examination)structural engineering, toxicology, pathology, anthropology, odontology, odontology, pathology, and review of suspicious documents.The crime scene staff may perform preliminary screening tests, sometimes known as presumptive testing, at the scene to assist in identifying the evidence that is most useful.Normally, traces of evidence at a crime scene shouldn't be taken from objects.As an alternative, the complete item should be processed in the lab.The evidence should be removed and packaged if it is tenuously attached to an object.Long before CSI arrives, the first step in an analysis of a crime scene is observation.It is used for police training.
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How do you know if two atoms will bond?
Answer:
The factor that determines whether or not two atoms will bond to form a molecule is their number of valence electrons.
Explanation:
Two atoms will bond if they have a difference in electrical charge. Atoms with an unequal number of protons and electrons have an electric charge, and when they come together they will form a chemical bond.
What is electrical charge?Electrical charge is an important physical property of matter that exists in two forms, positive and negative. Positively charged particles, such as protons, are attracted to negatively charged particles, such as electrons. In the most basic sense, electrical charge is simply a measure of the quantity of protons and electrons in a given object. In other words, it is a measure of the object's ‘electrical balance’. All matter is made up of atoms, and atoms are made up of positively charged protons and neutral neutrons, as well as negatively charged electrons. The number of protons and electrons in an atom is always equal, meaning that the atom (and therefore the object it is part of) has no net charge.
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How many grams (g) are in 0.329 moles of Ba3(PO4)2?
Answer:
About 203.381 grams
Explanation:
We need to first determine the molar mass of Ba3(PO4)2.
We have:
3 Bariums - 137.327*3 = 411.981
2 Potassiums - 39.098*2 = 78.198
8 Oxygens - 16*8 = 128
Add these together and we get 618.179 g/mol
If we only want 0.329 moles, then we multiply those two numbers together to get about 203.381 grams.
The reagents _____ and FeCl3 are required for the chlorination of benzene via electrophilic aromatic substitution
The reagents HCL and FeCl3 are required for the chlorination of benzene via electrophilic aromatic substitution.
What is the chlorination?
Chlorination is a chemical process in which one or more chlorine atoms are introduced into a molecule. In the context of benzene, chlorination refers to the reaction of benzene with HCl and FeCl3 to produce chlorobenzene via electrophilic aromatic substitution. In this reaction, the chlorine atom acts as an electrophile and reacts with the electron-rich aromatic ring of benzene, leading to the substitution of a chlorine atom for one of the hydrogen atoms in the ring.
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sodium azide (nan3) is sometimes added to water to kill bacteria. calculate the concentration of all species in a 0.016 m solution of nan3. the ka value for hydrazoic acid (hn3) is 1.9 × 10-5.
Sodium azide is a weak acid and it is formed by the reaction between weak acid (HN₃) and a strong base (NaOH). The solution contains Na⁺, N³⁻, H₂O are present in the solution. Molarity measures the amount of a solute.
What is molarity?Molarity measures the amount of a solute (substance being dissolved) in a given volume of a solvent (the dissolving medium).
Given information,
The concentration of NaN₃ = 0.016M
Ka value of hydrazoic acid (HN₃) = 1.9 × 10⁻⁵
The reaction is given as:
N³⁻(aq) + H₂O(l) → HN₃(aq) + OH⁻(aq)
[tex]\rm Kb = \frac{[HN_3] [OH_{6}^{-}]}{[N^{3-}]}\\\rm Kb = \frac{10^{-14}}{1.9\times10^{-5}} \\= 5.3\times10^{-10}\\\\\\[/tex]
Solving further,
[tex]\rm x^{2} + 5.3\times10^{-10}x - 8.48\times10^{-12} = 0\\\rm x = 2.91\times10^{-12}\\\rm x = \rm [OH^{-}] = [HN_{3}] = 2.91\times10^{-12}M\\[N^{3-}] = [Na^{+}] = 0.016M[/tex]
Therefore, the concentration of OH⁻ and HN₃ is 2.91x10⁻¹² M and the concentration of N³⁻ and Na⁺ is 0.016M.
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Your question is incomplete, most probably the full question is this:
Sodium azide (NaN3) is sometimes added to water to kill bacteria. Calculate the concentration for all species in a 0.016M solution of NaN3 the Ka value for hydrazoic acid ( HN3) is 1.9×10^-5.
what is the final temperature of the aluminum and water, given that the specific heat of aluminum is 0.903 j/(g·°c)?0.903 j/(g·°c)? assume no heat is lost to surroundings.
Given that aluminum has a specific heat of 0.903, the combined temperature of the metal and water is 34.61 °C.
With temperature and pressure, how do you determine the end temperature?Calculate the pressure to temperature ratio using the formula k = p1/T1. The comparable pressure in a similar container can be determined by multiplying any temperature value by k: p2 = k T2. By multiplying each amount of pressure by k, you can determine the temperature.
How can you determine the mixture's final temperature?Using the formula T(final) = (m1 T1 + m2 T2) / (m1 + m2), determine the final temperatures of the water mixture. T1 denotes the temperature of the first container of water, T2, and m1 and m2 denote the weights of the initial second containers of water, respectively.
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a homogeneous mixture of one or more solutes dissolved in a solvent
when a narrow diameter glass tube is inserted into a body of water, water rises in the tube and its surface inside is concave upwards. which statement, concerning the strength of the intermolecular forces between glass and water molecules compared to those between water molecules, is accurate? question 5 options: a) intermolecular forces are irrelevant to this situation. b) the forces of attraction between the glass and water are the same as those in water. c) the forces of attraction between the glass and water are stronger than those in water. d) the forces of attraction between the glass and water are weaker than those in water.
when a narrow diameter glass tube is inserted into a body of water, water rises in the tube and its surface inside is concave upwards. which statement, concerning the strength of the intermolecular forces between glass and water molecules compared to those between water molecules, is accurate
Option c is correct answer,
c) The forces of attraction between the glass and water are stronger than those in water.
Adhesion, which is connected to water's comparatively high surface tension, generates a force. Because the attraction between the glass and the water is often greater than that of the water itself, the concave force develops. You typically see a concave force, which is created when the molecules of the liquid are attracted to the molecules of the container.
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what kind of intermolecular forces act between a water molecule and a hydrogen fluoride molecule?
The type of the intermolecular forces act between a water molecule and a hydrogen fluoride molecule is the dipole dipole interaction.
The Dipole-Dipole interactions is the type of the intermolecular force of the attraction that occurs when the two dipolar molecules will interact with the each other through the space. The hydrogen fluoride, that is H-F and the water molecule that is H₂O both are the polar compound.
The Dipole-dipole forces are the attractive forces that arises between the positive end of the one polar molecule and the negative end of the other polar molecule.
Thus, the dipole dipole interaction is present between a water molecule and the hydrogen fluoride molecule.
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If salicylic acid dissociated into two particles when dissolved into myristic acid (it does not), would this change your calculated Kr value? Explain why.
The dissociation of salicylic acid into two particles does not modify the amount of solute in either phase, the ratio of solute concentration in one phase to concentration in the other phase remains constant. As a result, the dissociation has no effect on the computed Kr value.
The partition coefficient, commonly known as the Kr value, is a measure of the distribution of a solute between two immiscible phases. It is determined by the ratio of the solute concentration in one phase to the concentration in the other.
It is crucial to note that the dissociation of a solute into many particles can influence the solute's solubility in a given solvent, but this has no effect on the Kr value because the Kr value is a measure of the solute's distribution between two phases, not its solubility in a specific solvent.
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How many particles of O3 will be produced from 3 moles of NO2?
NO2 + O2 → NO + O3
A. 1.8 x 10^24particles
B. 6.02 x 10^24particles
C. 2.2 x 10^26particles
D. 8.1 x 10^23particles
According to stoichiometry and concept of Avogadro's number there are 1.8×10²⁴ particles of ozone produced from 3 moles of nitrogen dioxide.
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 equation 1 mole of nitrogen dioxide gives 1 mole of ozone, thus 3 moles of NO₂ will give 3×1/1=3 moles of ozone.3 moles of ozone has 3×6.023×10²³=1.8×10²⁴ particles of ozone .
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Is the following alkene E, Z, or neither? CH3 CH O E O Neither
The following molecule is neither E or Z configuration , it is the trans configuration.
The cis and trans approach will works if there is two identical groups that are connected to the double bond. The E, Z configuration works for the different substituent. the higher priority group on the each carbon is on the same or the opposite side of double bond. It is depends on the priority of the group.
The same group priority are on the same side of carbon double then it will be the Z configuration. If the same priority groups are on the opposite side than the configuration will be E configuration.
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Calculate the molecular masses of H2. ?
H2 has a molecular mass of 2 and a molecular weight of 1 u and 2u. When hydrogens join forces to form a hydrogen molecule, the result is a gas known as H2.
How can you determine an atom's mass?Find a Single Atom's Atomic Mass The alpha particle of a single particle can be determined by summing the total masses of the protons and neutrons in that particular isotope since their combined masses make up nearly each of the mass of a given atom.
How can you determine an element's atomic mass?The numbers of neutrons and protons in an atom are simply added to determine the atom of that particular atom. For instance,Think about an oxygen atom, which has 8 protons, 8 neutrons, and 8 electrons. You only need to multiply the atomic weight of oxygen by 8 electrons and 8 neutrons.
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If 75.0 mL of a .650M solution of methylamine is reacted with 7.50 grams of methylamine chloride (CH3NH3Cl), what is the new pH if the original pOH was 1.744? Kb = 5.0 x 10-4
Please explain
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. pH is a unitless quantity. Therefore, the pH of the solution is 2.7.
What is pH?
pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
Number of moles = .650M ×75.0 mL = 3.5 × 10⁻³ moles
Molarity of the methylamine = 3.5 × 10⁻³ moles/75.0 mL = 0.012 M
AH(aq) +H₂O ⇔H₃O⁺ (aq) + A⁻(aq)
I 0.012 0 0
C - x +x +x
E 0.012 -x x x
Kb= Antilog (-3.5) =5.0 x 10⁻⁴
Kb = [H₃O⁺] [A⁻]/[AH]
3.2 × 10⁻⁴ = x²/0.012 -x
3.2 × 10⁻⁴ (0.012 -x ) = x²
3.84 ×10⁻⁶ - 3.2 × 10⁻⁴x = x²
Solving the resulting quadratic equation
x=0.0018 M
pH=-log(0.0018 M) = 2.7
Therefore, the pH of the solution is 2.7.
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Which of the following statement(s) is(are) true for an IR-active bond?
A) The bond must be symmetrical.
B) A vibration must result in a change of bond length.
C) A vibration must result in a change of bond angle.
D) A vibration must result in a change of bond dipole.
E) All of these.
An IR-active bond must undergo a change in bond dipole due to vibration. Hence, statement (D) is true.
The vibration that takes place when IR radiation is absorbed must result in a shift in dipole moment for a molecule to become IR active. The alignment of the molecules and the photon's electric vector both affect the dipole moment, which is a vector quantity. As the connection grows and shrinks, the dipole moment changes. The change in dipole moment that takes place during the vibration determines the strength (intensity) of infrared absorption. No absorption will occur when there is no shift in the dipole moment, which prevents the radiation from interacting with the vibration.
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The movement of one or more _____ from one reactant to another is the key chemical event in an oxidation- ______ reaction, also called a(n)____ reation.
The movement of one or more electrons from one reactant to another is the key chemical event in an oxidation-reduction reaction, also called a(n) redox reaction.
What is a redox reaction?
A redox reaction (reduction-oxidation reaction) is a chemical reaction in which electrons are transferred from one molecule (the reductant) to another (the oxidant). This transfer leads to changes in the oxidation state of the molecules involved and results in the formation of two new species: a reduced species (acceptor of electrons) and an oxidized species (donor of electrons). This type of reaction is important in many natural processes, such as cellular respiration, corrosion, and photosynthesis.
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How many set(s) of magnetically non-equivalent protons are found in (CH3)2CHCH2CH2CI?
a) 3
b) 4 c) 5 d) 7 e) 11
Option B. 4. The molecule (CH3)2CHCH2CH2CI has 4 magnetically non-equivalent protons. These protons are found on the methylene (-CH2-) and methine (-CH-) groups in the molecule.
The symmetry of the molecule and the coupling between the protons can lead to some protons being magnetically equivalent, meaning that they have the same chemical shift and coupling constants. However, there are 4 distinct sets of protons in this molecule that are magnetically non-equivalent. In the molecule (CH3)2CHCH2CH2CI, there are 4 sets of magnetically non-equivalent protons, each having a different chemical environment and hence a different magnetic environment. These protons can be found on the carbon atoms that are bonded to different number of hydrogens and other atoms.
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