Explanation:
The theoretical volume of ammonia that should be produced in the Haber process if we start with 5.0 L of nitrogen (N2) at standard temperature and pressure (STP) can be calculated as follows:
1 mole of N2 reacts with 3 moles of H2 to form 2 moles of NH3
Thus, the number of moles of N2 present can be calculated using the Ideal Gas Law:
PV = nRT
Where n is the number of moles of gas, R is the gas constant, T is the temperature in Kelvin, P is the pressure in atmospheres, and V is the volume in liters.
At STP (0°C and 1 atm), the volume of one mole of gas is 24.45 L.
Given 5.0 L of N2 at STP, the number of moles of N2 can be calculated as:
n = (PV)/RT = (1 atm)(5.0 L)/(0.0821 atmL/molK)(273 K) = 1.96 moles
The number of moles of NH3 produced can then be calculated as:
n = (2 moles of NH3)/(1 mole of N2) = 2 moles/1 mole = 2 moles
The volume of NH3 can be calculated as:
V = nRT/P = (2 moles)(0.0821 atmL/molK)(273 K)/(1 atm) = 44.8 L
So, the theoretical volume of ammonia (NH3) that should be produced if we start with 5.0 L of N2 at STP is 44.8 L.
2. Which wave needs a medium to transfer energy?
A Longitudinal waves
B Transverse waves
C Electromagnetic Waves
D Both
Briefly describe what happens during each step of photosynthesis:
Sunlight absorption:
Light-dependent reactions:
Light-independent reactions:
Photosynthesis is the process in which plants use sunlight, water, and carbon dioxide to make oxygen and energy in the form of sugar. During each step of photosynthesis that is Sunlight absorption, Light-dependent reactions, Light-independent reactions explain in below description.
What is photosynthesis ?Sunlight absorption: Special pigments in photosynthetic cells absorb light energy. Plant pigment molecules absorb light with wavelengths ranging from 400 nm to 700 nm. This wavelength range is known as photosynthetically active radiation (PAR).
Light-dependent reactions: Light energy is used in light-dependent reactions to create two molecules required for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. Light reactions occur in the thylakoid membranes of chloroplast organelles in plants.
Light-independent reactions: Photosynthesis's light-independent reactions occur within the stroma. It contains enzymes that, in collaboration with ATP and NADPH, "fix" carbon from carbon dioxide into molecules that can be used to make glucose. The stroma also stores the chloroplast's own genetic material.
Thus, These are the steps of photosynthesis.
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What type of decay is this?
Beta decay will occur in isotopes with a N/Z ratio greater than 1, which translates to an overabundance of neutrons.
How do you know if its alpha or beta decay?Beta decay produces a new element that has one more proton and one fewer neutron while alpha decay produces a new element with some less protons and two fewer neutrons. When a nucleus from a higher energy state descends to a lower energy state and releases the excess energy through to the emission of high energy photons, this process is known as gamma decay.
Any one of three radioactive disintegration processes known as beta decay occurs when some unstable atoms spontaneously release surplus energy and undergo a shift in one unit of positive ions without changing their mass number.
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How do I balance the equations out
Equations are balanced using the idea of chemical reactions. to ensure that the reactant side and product side are in equilibrium the steps are below
How to balance equationsBalancing chemical equations means making sure that the same number of atoms of each element are present on both sides of the equation. Here are the steps to balance a chemical equation:
Write the unbalanced equation.Assign oxidation numbers to each element in the equation.Identify the element that needs to be balanced first.Add coefficients in front of the chemical formulas to balance the number of atoms of the selected element.Repeat the process for each element in the equation until the equation is balanced.Check the balanced equation to make sure all elements are balanced.It's important to keep in mind that the coefficients should be kept in their lowest whole number ratios, and you can use fractional coefficients if necessary. If the equation is already balanced, no further action needs to be taken.
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The common pain relievers – aspirin (C9H8O4), acetaminophen (C8H9NO2), and naproxen sodium (C14H13O3Na) – are available in tablets containing 229 mg of the active ingredient. Express your answers to three significant figures.
229 mg aspirin = _____ C9H8O4 molecules
229 mg acetaminophen = _____ C8H9NO2 molecules
229 mg naproxen sodium = ______ C14H13O3Na molecules
The number of molecules for 229 mg
Aspirin is 7.66 × 10²⁰ molecules.Acetaminophen is 9.13 × 10²⁰ molecules.Naproxen sodium is 5.47 × 10²⁰ molecules.The atomic mass from
C = 12 g/molH = 1 g/molN = 14 g/molO = 16 g/molNa = 23 g/molMolecular mass is the sum of all the atomic mass in the compound.
Aspirin C₉H₈O₄According to Stoichiometry to calculate the number of moles of a compound
n = m ÷ M
X = n × L
n = number of molesm = mass (grams)Calculating the number of molecules
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I need help answering these
How many significant figures are in each of the following numbers?
a. 225.0
c. 0.0003210
b. 1000.0
d. 0.0067
e. 1,000,000.
f. 2.00001
Round off each of the following numbers to three significant figures.
a. 15.9994
c. 0.6654
e. 87,550
b. 1.0080
d. 4885
f. 0.027225
3. Perform the indicated arithmetic operations, and round the results to the appropriate number of significant figures or decimal places.
a. 77.981 x 2.33
b. 4 x 0.0665 =
c. 17.344.900 + 23.1
d. 9.80 4.762 =
e. 3.9 X 6.05 X 420 =
f. 14.1/5
g. 1001 + 16.23 =
h. 424.5+ 2.8461 =
i. 9.9-9.54
j. 7.3778 0.000265 =
k. (24.358)(6.4)
1. (48.6)(0.6959)
a. 225.0 has 4 significant figures.
b. 1000.0 has 4 significant figures.
c. 0.0003210 has 6 significant figures.
d. 0.0067 has 4 significant figures.
e. 1,000,000 has 7 significant figures.
f. 2.00001 has 6 significant figures.
Question 2
a. 15.9994 rounded to three significant figures is 16.0.
b. 1.0080 rounded to three significant figures is 1.01.
c. 0.6654 rounded to three significant figures is 0.665.
d. 4885 rounded to three significant figures is 4885.
e. 87,550 rounded to three significant figures is 88,000.
f. 0.027225 rounded to three significant figures is 0.0272.
Question 3
a. 77.981 x 2.33 = 181.081 (rounded to 3 significant figures)
b. 4 x 0.0665 = 0.266 (rounded to 3 significant figures)
c. 17,344,900 + 23.1 = 17,344,923.1 (rounded to 7 significant figures)
d. 9.80 - 4.762 = 5.038 (rounded to 3 significant figures)
e. 3.9 x 6.05 x 420 = 8,595.89 (rounded to 2 decimal places)
f. 14.1 / 5 = 2.82 (rounded to 2 decimal places)
g. 1001 + 16.23 = 1017.23 (rounded to 4 significant figures)
h. 424.5 + 2.8461 = 427.3461 (rounded to 4 decimal places)
i. 9.9 - 9.54 = 0.36 (rounded to 2 decimal places)
j. 7.3778 / 0.000265 = 27,864.345 (rounded to 3 decimal places)
k. (24.358) x (6.4) = 156.3712 (rounded to 4 decimal places)
(48.6) x (0.6959) = 33.88594 (rounded to 5 decimal places)
What is significant figures?Significant figures of a number in positional notation are described as digits in the number that are reliable and necessary to indicate the quantity of something.
Decimal places on the other hand are described as positions of the digits to the right of a decimal point. Rounding numbers to decimal places is shortening a decimal number to a given degree of accuracy.
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After a precipitation reaction with 0.64M H2SO4 was completed, you centrifuge the sample, dry and weigh it. The ppt is found to weigh 0.109 grams. Based on this mass, what was the original concentration of the unknown Pb(NO3)2 solution in mol/L? Answer to 3 sf.
The original concentration of the Pb(NO₃)₂ solution in mol/L would be 0.00036 moles / 0.64 L = 0.0000056 mol/L = 0.056 mM (rounded to 3 significant figures).
We must do a mass-to-moles conversion to ascertain the Pb(NO3)2 solution's initial concentration. The following equation describes the precipitation reaction between Pb(NO₃)₂ and H₂SO₄:
Pb(NO₃)₂ + H₂SO₄ -> PbSO₄ + 2HNO₃
PbSO₄ has a molar mass of 303.2 g/mol.
Therefore, 0.00036 moles of PbSO₄ are equal to 0.109 g of PbSO₄ divided by 303.2 g/mol.
Therefore, 0.00036 moles of PbSO₄ are equal to 0.109 g of PbSO₄ divided by 303.2 g/mol. Since the ratio of Pb(NO₃)₂ to PbSO4 in the reaction is 1:1, we can infer that the initial solution included the same number of moles of Pb(NO₃)₂
Since the ratio of Pb(NO₃)₂ to PbSO₄ in the reaction is 1:1, we can infer that the initial solution included the same number of moles of Pb(NO₃)₂ The Pb(NO₃)₂ solution's initial concentration would therefore be 0.00036 moles / 0.64 L = 0.0000056 mol/L = 0.056 mM. (rounded to 3 significant figures).
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How can you determine if a substance is hydrophobic?
Answer :Hydrophobicity is measured in terms of the contact angle of the water drops to the surface of textiles
Explanation:
5.6 mol N2O5
Express your answer using two significant figures
Mole is one of the International System of Units' seven foundation units, in reality (SI). Units are created when preexisting ones are insufficient. Therefore, 11.2moles of NO[tex]_2[/tex] is produced.
What is mole?Simply put, a mole is a measuring unit. It's one of the International System of Units' seven foundation units, in reality (SI). Units are created when preexisting ones are insufficient.
At the same time that using official figures of atoms, molecules, or ions would be unclear, chemical reactions frequently occur at low concentrations where using grams would've been inappropriate. Therefore, the mole was created by scientists to fill the gap between extremely small and extremely huge quantities.
2N[tex]_2[/tex]O[tex]_5[/tex](g)→4NO[tex]_2[/tex](g)+O[tex]_2[/tex](g)
moles of N[tex]_2[/tex]O[tex]_5[/tex] = 5.6 mol
the mole ratio between N[tex]_2[/tex]O[tex]_5[/tex] and NO[tex]_2[/tex] is 1:2
moles of NO[tex]_2[/tex] = 2× 5.6=11.2moles
Therefore, 11.2moles of NO[tex]_2[/tex] is produced.
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what is the ion concentration of 0.05 M Cacl2?
The ion concentration of 0.05 M [tex]CaCl_2[/tex] would be 0.05 mol Ca ions and 0.1 mol Cl ions respectively.
Concentration of ions[tex]CaCl_2[/tex] contains two ions according to the following equations:
[tex]CaCl_2 -- > Ca^{2+} + 2Cl^-[/tex]
1 mole 1 mole 2 moles
0.05 M CaCl2 contains 0.05 moles of the solute in 1 liter of the solution. Thus, the equivalent mole of Ca ion would be 0.05 moles while that of Cl ion would be 0.10 mole (0.05x2).
Concentration of Ca ions = 0.05 moles
Concentration of Cl ions = 0.05 x 2 = 0.010 moles
In other words, the ion concentrations of 0.05 M CaCl2 would be 0.05 moles of Ca ions and 0.10 moles of Cl ions.
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Look at the window on the left side of the simulation. It shows the reaction A + BC ⇌ AB + C. How does this reaction differ from the reaction by which ammonia is synthesized?
A + BC → AB + C "single replacement reaction" while ammonia synthesis is a "synthesis reaction".
What is a single replacement reaction?A single replacement reaction is a reaction by which one element replaces an/another element in a compound.
It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product.
A chemical reaction known as a synthesis occurs when two or more simple chemicals combine to create a more complex result. The result is always a chemical, while the reactants can be either elements or other compounds.
Example: ammonia synthesis,
N₂ + 3H₂ ⇄ 2NH₃
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Pieces of potassium (Φ = 3.68 × 10–19 J) and sodium (Φ = 4.41 × 10–19 J) metal are exposed to radiation of wavelength 290.0 nm.
What is the velocity of the electrons from sodium?
What is the velocity of the electrons from potassium?
Answer:
Explanation:
The velocity of electrons can be calculated using the equation v = h / (mλ), where h is Planck's constant (6.63 x 10^-34 Js), m is the mass of the electron, and λ is the wavelength of the radiation.
For sodium, the electron energy is given as Φ = 4.41 × 10–19 J. To find the velocity of the electrons, we first need to convert the energy into wavelength using the equation λ = hc / Φ, where c is the speed of light (3 x 10^8 m/s).
So, for sodium:
λ = hc / Φ = 6.63 x 10^-34 x 3 x 10^8 / 4.41 x 10^-19
λ = 290 nm.
And then using the velocity equation,
v = h / (mλ) = 6.63 x 10^-34 / (9.11 x 10^-31 x (290 x 10^-9))
For potassium, the electron energy is given as Φ = 3.68 × 10–19 J, and the wavelength can be calculated in the same way as for sodium:
λ = hc / Φ = 6.63 x 10^-34 x 3 x 10^8 / 3.68 x 10^-19
λ = 290 nm.
And then using the velocity equation,
v = h / (mλ) = 6.63 x 10^-34 / (9.11 x 10^-31 x (290 x 10^-9))
Note: m is the mass of an electron, which is 9.11 x 10^-31 kg.
So, both the velocity of the electrons from sodium and potassium would be the same, given that they are both exposed to the same wavelength radiation of 290 nm.
Answer:The velocity of electrons from sodium and potassium can be calculated using the equation E=hf, where E is the energy of the electron, h is Planck's constant and f is the frequency of the radiation.
From the equation E=hf, f can be calculated using the wavelength of the radiation:
f = c/λ
where c is the speed of light.
Then, using E=hf and the values for E (Φ) for sodium and potassium, the velocity of the electrons can be calculated using the equation:
v = sqrt(2E/m)
where m is the mass of the electron.
Explanation:
The velocity of electrons from sodium and potassium can be calculated using the equation E=hf, where E is the energy of the electron, h is Planck's constant and f is the frequency of the radiation.
From the equation E=hf, f can be calculated using the wavelength of the radiation:
f = c/λ
where c is the speed of light.
Then, using E=hf and the values for E (Φ) for sodium and potassium, the velocity of the electrons can be calculated using the equation:
v = sqrt(2E/m)
where m is the mass of the electron.
A 11.5 g sample of CaSO4 is found to contain 3.39 g of Ca and 5.41 g of O. Find the mass of sulfur in a sample of CaSO4 with a mass of 67.0 g.
The mass of sulfur in a sample of CaSO4 with a mass of 67.0 g would be 15.73 grams.
Dimensional Analysis11.5 grams of CaSO4 contains 3.39 grams of Ca and 5.41 g of O.
Mass of sulfur = 11.5 - (3.39 + 5.41) = 2.7 grams
11.5 grams of CaSO4 contains 2.7 grams of sulfur. The mass of sulfur in 67.0 grams of CaSO4 can be estimated as:
11.5 grams CaSO4 = 2.7 grams S
67.0 grams CaSO4 = 67.0 x 2.7/11.5
= 15.73 grams
In other words, if 11.5 grams of CaSO4 contains 2.7 grams of S, then 67.0 grams will contain 15.73 grams of sulfur.
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Find the heat of solution for potassium perchlorate when 10.5 g
of potassium perchlorate is dissolved with enough water to make 113.8 mL
of solution.
Potassium perchlorate (KClO4)
has a lattice energy of -599 kJ/mol
and a heat of hydration of -548 kJ/mol
The heat of solution for 10.5 g of potassium perchlorate dissolved in 113.8 mL of water is approximately -83.99 kJ/10.5 g.
What is heat of solution?The heat of solution is described as the enthalpy change associated with the dissolution of a substance in a solvent at constant pressure resulting in infinite dilution.
For 10.5 g of potassium perchlorate dissolved in 113.8 mL of water, the amount of heat released can be estimated as follows:
-599 kJ/mol x (10.5 g / 138.55 g/mol) = -44.31 kJ
-548 kJ/mol x (10.5 g / 138.55 g/mol) = -39.68 kJ
The heat of solution for potassium perchlorate will then be calculated as the sum of the lattice energy and heat of hydration which gives us that
Heat of solution = -44.31 kJ + -39.68 kJ = -83.99 kJ/10.5 g
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What is the percent of O in
Ca(C2H302)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol,
H= 1.01 g/mol, O = 16.00 g/mol)
[?]% O
Round your answer to the hundredths place.
% O
Ca(C2H3O2)2 has 30.41% carbon by volume, according to calculations.
How can the percentage of an element in a compound be calculated?By dividing the atomic mass of the element by the molar mass of the compound, then by 100%, one can get the percentage of the element in a compound.
The percentage form of the mixture is obtained by multiplying this ratio by 100.
By dividing the atomic mass of the element by the molar mass of the compound, then by 100%, one can get the percentage of the element in a compound.
Atomic mass of C divided by the molar mass of Ca(C2H3O2) yields the percentage of carbon.
₂ × 100%
Ca(C2H3O2)2 has an atomic mass of 40 plus (24 plus 3 plus 32).
2 = 158g/mol \s % C = 12.01(4)/158 × 100 \s % C = 30.41%.
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copper exists as a mixture of 2 isotopes, 70.5% Cu-63, with a mass of 62.96 amu, and 29.5% Cu-65, with a mass of 64.96 amu. what is the average atomic weight?
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the average atomic mass of copper is 63.55amu.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)
Substituting the given values, we get
Average atomic mass=( 62.96 amu × 70.5% )+(64.96 amu ×29.5% )
Average atomic mass=55.58+12.27
Average atomic mass=63.55amu
Therefore, the average atomic mass of copper is 63.55amu.
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How do you prove the chemical formula for a covalent bond using Lewis dot structures?
Lewis structures are useful for visualizing both ionic and covalent bonds. In the idealized ionic bond.
Does Lewis's structure show covalent bonds?In covalent bonding, nonmetallic elements part electrons so that both elements can have a full valence shell. Covalent bonds can be meant with electron dot formulas. These are often mentioned as Lewis structures and are a little different than the electron dot formulas used to constitute ionic bonds.
Lewis one atom gives up an electron to the other, forming positive and negative ions. The state for bonds is that the total structure charge is zero and that each atom must have a gentle gas electron configuration. In covalent combination, the Lewis Dot Structures must show
So we can conclude that Using Lewis structure Symbols to relate Covalent Bonding.
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What happened to the liquid in titans lake?
The liquid in Titan's lake is believed to be composed of liquid methane and ethane, which are thought to be supplied by geological processes such as cryovolcanism and seepage from the surrounding terrain. Over time, the liquid in Titan's lake can evaporate, change due to geological or meteorological processes, or be affected by the changing seasons on the moon.
one mole of carbon weighs 12 grams reacts with one mole of oxygen gas weighing 32 grams to produce only carbon dioxide according to the equation
One mole or 12 g of carbon reacts with one of oxygen molecule weighs 32 g will produce one mole of carbon dioxide. One mole of carbon dioxide weighs 44 g.
What is carbon dioxide ?Carbon dioxide is an inorganic gas formed by the covalent bonding between carbon and oxygen gas. Carbon dioxide is an essential gas to maintain the living atmosphere in earth.
The balanced chemical equation of the reaction between oxygen gas and carbon is given below:
[tex]\rm C+O_{2} \rightarrow CO_{2}[/tex]
As per this equation, one mole of carbon reacts with one mole of oxygen gas:
Atomic mass of carbon = 12g
molecular mass of oxygen = 32 g
then molar mass of carbon dioxide = 32+ 12 = 44 h=g.
Therefore, 44 g of carbon dioxide is produced in this reaction.
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Water can be decomposed into its constituent elements, 2 H2O(l) → 2 H2(g) + O2(g), with an electrical current in a process called electrolysis. If 1.2 g of H2O is subjected to electrolysis and the products are collected in a cylinder with a volume of 0.20 L and a temperature of 30 °C, what is the partial pressure of H2?
The number of moles of hydrogen gas produced from 1.2 g of water is 0.06 moles. Then, the partial pressure of hydrogen gas is 4.9 atm.
What is partial pressure ?The partial pressure of a gas in a mixture is the contribution of the gas to the total pressure of the mixture.
The molar mass of water = 18 g/mol
mass = 1.2 g
number of moles = 1.2/18 =0.06 moles.
now the total pressure p = nRT/v
V = 0.20 L
T = 30°C =303 K
then p = (0.06 mol × 0.082 L atm/ K mol × 303 K) / 0.20 L = 7.4 atm.
Now, 2 moles of water gives 2 moles of hydrogen gas and one mole of oxygen. Then 0.06 moles of water gives 0.06 moles of hydrogen and 0.03 moles of oxygen.
Then, mole fraction of hydrogen = 0.06/(0.03 + 0.03) = 0.66.
Partial pressure of hydrogen = total pressure × mole fraction
= 0.66 × 7.4 atm = 4.9 atm.
Therefore, the partial pressure of hydrogen gas is 4.9 atm.
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According to Newton's First Law, what potential impact can an unbalanced force have on an object in motion?
Newton's first law states that unless acted on by an unbalanced force, an object will remain at rest or move at a constant speed in a straight line. To move the book on your desk, Newton's first law requires an unbalanced force.
What is Newton's first law ?The First Law of Motion of Newton (Inertia) Unless acted on by an unbalanced force, an object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line.
When an unbalanced force acts on an object, the object's motion changes. The object's speed or direction may change. Friction is a force that opposes motion or the tendency for motion between two objects in contact.
Thus, an object will remain at rest or move at a constant speed in a straight line.
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1. The 0.9 g sample of ascorbic acid (vitamin C) was dissolved in 95 g of water. The concentration of ascorbic acid, as determined by freezing-point depression, is 0.0555 m. What is the molecular weight of the ascorbic acid?
The molecular weight of the ascorbic acid (vitamin C), given that 0.9 g of the acid was dissolved in 95 g of water is 170.7 g/mol
How do I determine the molecular weight of the ascorbic acid?We'll begin by obtaining the mole of the ascorbic acid in the solution. Details below
Mass of water = 95 g = 95 / 1000 = 0.095 KgMolality of solution = 0.0555 MMole of ascorbic acid =?Mole = Molality × mass of water (in kg)
Mole of ascorbic acid = 0.0555 × 0.095
Mole of ascorbic acid = 0.0052725 mole
Finally, we shall determine the molar mass of the ascorbic acid. Details below
Mole of ascorbic acid = 0.0052725 moleMass of ascorbic acid = 0.9 gMolar mass of ascorbic acid =?Molar mass = mass / mole
Molar mass of ascorbic acid = 0.9 / 0.0052725
Molar mass of ascorbic acid = 170.7 g/mol
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Please help me I don’t have idea,please
4.4 a. The metal that the main part of the garden fork has been made from is iron. The correct option is B
b. The chemical name for rust is hydrated iron (iii) oxide
c. One way of preventing the fork from rusting is by painting the fork.
4.5 Based on the given equations;
a. the equation that produces a metal oxide is equation D.
b. the equation that is a neutralization reaction is equation B.
c. the equation that is a burning reaction is equation A.
The complete equation for the given equations are:
d. sodium + water → sodium hydroxide + hydrogen
e copper carbonate + sulfuric acid → copper sulfate + carbon dioxide + water
f. sulfur + oxygen → sulfur dioxide
What is rust?Rust is an iron oxide, a typically reddish-brown oxide created when iron and oxygen react catalytically with moisture from the air or water.
Iron(III) oxide-hydroxide and hydrated iron(III) oxides make up rust, which is often linked to the corrosion of refined iron.
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When a cracker dissolves in your mouth, is that physical or chemical change?
When a cracker dissolves in your mouth, then this is a chemical change. A chemical reactions is an atomic rearrangement-based chemical process.
What is chemical change?An alteration of one or more compounds as one or maybe more new and distinct substances is referred to as a chemical change or chemical reaction. In other terms, a chemical reactions is an atomic rearrangement-based chemical process.
A chemical change normally cannot be reversed unless through additional chemical processes, although a physical change may frequently be done so. The power of the system changes when a chemical shift takes place. When a cracker dissolves in your mouth, then this is a chemical change.
Therefore, when a cracker dissolves in your mouth, then this is a chemical change.
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HELP⚠️
On a mission to a newly discovered planet, an astronaut finds gallium abundances of 60.11% for 69^Ga and 39.89% for 71^Ga. What is the atomic mass of gallium for this location?
The mass of 69^Ga is 68.7200 amu. The mass of 71^Ga is 70.9200 amu.
-Express you’re answer to two decimal places, and include the appropriate units
Explanation:
The atomic mass of gallium for this location can be calculated using the following formula:
Atomic mass = (69^Ga abundance x 69^Ga mass) + (71^Ga abundance x 71^Ga mass)
Plugging in the values:
Atomic mass = (0.6011 x 68.7200 amu) + (0.3989 x 70.9200 amu) = 41.4762 amu + 28.2957 amu = 69.7719 amu
Therefore, the atomic mass of gallium for this location is 69.77 amu.
A change in tempo is the only thing that can make a musical cliché more effective.
A. False, a change in dynamics is the only thing that can make a musical cliché more effective.
B. True
C. False, using changes in tempo and dynamics can make a musical cliché more effective.
D. False, a change in tempo cannot make a musical cliché more effective.
False, using changes in tempo and dynamics can make a musical cliché more effective. Hence, option C is correct.
What is musical tempo ?Tempo in a music refers to pace of the music especially in high pitch sound waves. The most common unit of measurement for tempo is beats per minute (BPM), which is just the quantity of beats that may be captured in a minute at a certain pace.
A musical segment or composition is slower when the beats per minute is lower than when the BPM is greater. While a higher BPM is more likely to make the listener feel excited, a lower BPM is more likely to have a calming and/or sad effect on the listener.
Changing dynamics is some more effective way to make musical cliché. Hence, option C is correct.
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If you do not answer this you will feel bad for not answering it. Then hopefully you will come back and answer it.
N2SO4 + 2NaOH --> H2O + Na2SO4
How many molecules of water are produced if 2.0g of sodium sulfate are produced in the reaction above?
Question 3 options:
8.5 x 1021 molecules
8.5 x 1023 molecules
6.77 x 1022 molecules
2.0 x 1023 molecules
The balanced chemical equation for the reaction is:
N2SO4 + 2NaOH → Na2SO4 + 2H2O
From the equation, we can see that for every 1 molecule of sodium sulfate (Na2SO4), 2 molecules of water (H2O) are produced. Therefore, to find the number of molecules of water produced, we need to determine the number of molecules of sodium sulfate produced in the reaction.
To do this, we need to use the molar mass of sodium sulfate and Avogadro's number. The molar mass of sodium sulfate is 142.04 g/mol, and Avogadro's number is 6.022 x 10^23.
The number of molecules of sodium sulfate produced in the reaction can be calculated as follows:
(2.0 g) / (142.04 g/mol) = 0.01405 mol
And the number of molecules of water produced can be calculated as follows:
0.01405 mol x 2 molecules/mol = 0.0281 x 6.022 x 10^23 molecules/mol = 1.69 x 10^23 molecules
Round 1.69 to 2.0 and your answer is 2.0 x 1023 molecules
3.32×10^−5g to micrograms
Express your answer to three significant figures and include the appropriate units.
Check that you have converted between SI units of mass correctly.
Answer: 33.2 micrograms
Explanation:
We are going to convert grams to micrograms.
Step 1
Determine the conversion factors to use for converting grams to micrograms.
1 gram = 1000 milligrams
1 milligram = 1000 micrograms
Step 2
Use the number in the problem and the conversion factors to set up the problem so all conversion factors cancel except micrograms.
3.32 x 10⁻⁵ grams x (1000 milligrams/1 gram) x (1000 micrograms/1 milligram) = 33.2 micrograms/1 = 33.2 micrograms
Note that grams and milligrams cancel and you are left with micrograms. The given quantity 3.32 x 10⁻⁵ grams has 3 significant figures, so the final answer should have 3 significant figures too.
A solution containing 26.75 mg of an unknown protein per 23.0 mL of solution was found to have an osmotic pressure of 3.54 torr at 27 ∘C.
What is the molar mass of the protein
The osmotic pressure of the protein solution is given 3.54 torr or 0.004 atm. Then, the molar mass of the protein is 7222 g/mol.
What is osmotic pressure ?The pressure required to stop the flow or diffusion of solvent molecules through a semipermeable membrane is called osmotic pressure. The osmotic pressure is represented as π and is related to the pressure, volume and number of moles as follows:
π = n RT
given π = 3.54 torr = 0.004 atm
volume v = 23 ml = 0.023 L
temperature = 27 °C = 300 K
R = 0.082 L atm/ K mol
then, n = π V/RT
n = 0.004 atm ×0.023 L /(0.082 L atm/ K mol × 300 K)
= 3.69× 10⁻⁹.
weight of the protein sample = 26.75 mg = 0.026 g
then, molar mass = 0.026 g/ 3.69× 10⁻⁹mol = 7222 g/mol
Therefore, the molar mass of the protein sample is 7222 g/mol.
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Identify the kind of intermolecular forces that would occur between the solute and solvent in each case.
A. Butter
B. Kerosene
C. Ethanol
D. Calcium Fluoride
The intermolecular force present in butter is London dispersion forces. In kerosene, covalent bonding between carbon and hydrogen atoms are present.
What is intermolecular force ?Intermolecular forces are force exerted between two molecules which can be of attraction or repulsion. The intermolecular force of attraction make the atoms binded in a compound or molecule.
In butter, the hydrocarbon molecules exerts a London dispersion forces between two non-polar molecules. In kerosene, the hydrocarbon molecules are bound by covalent bonding between carbon atoms.
In ethanol, the OH group make it possible to form hydrogen bonds between ethanol molecules. In the case of calcium fluoride, dipole, dipole forces exists. Since the compound is ionic and have a permanent dipole moment.
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