Question 1

A 1.5 g tablet for pain might contain 0.30 g acetaminophen C₈H₉NO₂, 151.16 g/mol) and 0.044 g codeine (C₁₈H₂₁NO₃, 299.36 g/mol).Calculate the number of moles of codeine in the tablet.

Accepted Answer

The number of moles of codeine in the tablet can be calculated using the formula:moles of codeine = mass of codeine / molar mass of codeineSubstituting the given values into the formula, we get:moles of codeine = 0.044 g / 299.36 g/mol = 1.5 x 10^-4 molTherefore, the correct answer is A.

Question 2

What is the mass of one ozone molecule, O₃, in grams? Round your answer to two significant figures.(1 amu = 1.6605 *10^-27 kg)

Accepted Answer

The mass of one ozone molecule can be calculated by multiplying the molar mass of ozone (48 g/mol) by the conversion factor from amu to grams (1 amu = 1.6605 x 10^-24 g). The result is approximately 8.0 x 10^-23 g.

Question 3

Cyanidin chloride (C₁₅H₁₁O₆Cl, 322.7 (g/mol) contains the cyanidin ion, a pigment found in many berries.Calculate the number of moles of cyanidin chloride equivalent to 7.2 mg.

Accepted Answer

The answer of Cyanidin chloride (C₁₅H₁₁O₆Cl, 322.7 (g/mol) contains the...

Question 4

A 1.5 g tablet for pain might contain 0.30 g acetaminophen (C₈H₉NO₂, 151.16 g/mol) and 0.044 g codeine (C₁₈H₂₁NO₃, 299.36 g/mol).Calculate the number of moles of acetaminophen in the tablet.

Accepted Answer

The number of moles of acetaminophen is calculated using the formula: moles = mass (g) / molar mass (g/mol). For acetaminophen, this is 0.30 g / 151.16 g/mol = 0.001985 mol, which rounds to 2.0 x 10^-3 mol.

Question 5

Suppose you were given one gold atom every second since the big bang occurred about 14 billion years ago (1.4 * 10¹⁰years).How many moles of gold atoms would you have?

Accepted Answer

The answer of Suppose you were given one gold atom...

Question 6

TNT, or trinitrotoluene, has the chemical formula C₇H₅N₃O₆.How many grams of nitrogen are present in 25 g TNT (227.13 g/mol)?

Accepted Answer

The molar mass of TNT is 227.13 g/mol. The molar mass of nitrogen is 14.01 g/mol. There are 3 nitrogen atoms in each molecule of TNT. Therefore, the mass of nitrogen in 25 g of TNT is:(25 g TNT) x (1 mol TNT / 227.13 g TNT) x (3 mol N / 1 mol TNT) x (14.01 g N / 1 mol N) = 4.6 g N

Question 7

Two inorganic blue pigments are Han blue (BaCuSi₄O₁₀) and Egyptian blue (CaCuSi₄O₁₀)_. Which has a higher molar mass and by how much?

Accepted Answer

The answer of Two inorganic blue pigments are Han blue...

Question 8

Which statement is true about the mole and molar mass?

Accepted Answer

A mole is defined as the number of particles (atoms, molecules, ions, or other entities) equal to the number of atoms in exactly 12 grams of carbon-12, making statement A correct.

Question 9

Iron can form two ionic compounds with sulfur, one containing Fe²⁺ and the other containing Fe³⁺.What is the difference in their formula unit masses?

Accepted Answer

The answer of Iron can form two ionic compounds with...

Question 10

Highly enriched weapons-grade uranium might consist of exactly 90% U-235 (235.044 amu), with the remainder being U-238 (238.051 amu).What is the average atomic mass of this sample of highly enriched uranium? Assume the percentages are exact.

Accepted Answer

The answer of Highly enriched weapons-grade uranium might consist of...

Question 11

Antirrhinin chloride (C₂₇H₁₁O₆Cl, 630.97 g/mol) contains the antirrhinin ion, a pigment found in açai berries.Calculate the number of moles of carbon in 1.5 g of antirrhinin chloride.

Accepted Answer

First, calculate the moles of antirrhinin chloride: 1.5 g / 630.97 g/mol = 0.00238 mol. Since there are 27 carbon atoms in each molecule, multiply by 27: 0.00238 mol * 27 = 0.06426 mol of carbon, which is 6.4 x 10^-2 mol.

Question 12

The average atomic mass of lithium is 6.941 amu.Lithium has two naturally occurring isotopes, ⁶Li (7.52%) and ⁷Li (92.48%).The mass of ⁶Li is 6.0151 amu.What is the isotopic mass of ⁷Li?

Accepted Answer

The isotopic mass of $ ^7Li $ can be calculated using the formula for average atomic mass: $$ \text{Average atomic mass} = \sum (\text{fractional abundance} \times \text{isotopic mass}) $$ Given that the average atomic mass of lithium is 6.941 amu, and we have the isotopic mass and abundance for $ ^6Li $ (6.0151 amu and 7.52%), we can solve for the isotopic mass of $ ^7Li $ as follows: $$ 6.941 = (0.0752 \times 6.0151) + (0.9248 \times \text{isotopic mass of } ^7Li) $$ Solving for the isotopic mass of $ ^7Li $ gives approximately 7.016 amu.

Question 13

How many hydrogen atoms are in 102 amu of pure ammonia (NH₃)?

Accepted Answer

Ammonia (NH3) has a molar mass of approximately 17 g/mol (14 for nitrogen and 1 for each hydrogen atom). 102 amu of ammonia is equivalent to 102 g, which is 102/17 = 6 moles of ammonia. Since each molecule of ammonia contains 3 hydrogen atoms, 6 moles of ammonia contain 6 * 3 = 18 hydrogen atoms.

Question 14

Calculate the number of molecules in 0.25 mol of strychnine, C₂₁H₂₂N₂O₂.

Accepted Answer

The answer of Calculate the number of molecules in 0.25...

Question 15

Calculate the number of americium-241 atoms present in a smoke alarm containing 0.60 $\mu$g of radioactive ²⁴¹Am (241.06 g/mol).

Accepted Answer

To calculate the number of americium-241 atoms in 0.60 micrograms of the substance, use the formula: number of atoms = (mass / molar mass) * Avogadro's number. First, convert micrograms to grams: 0.60 μg = 0.60 x 10^-6 g. Then, calculate the number of moles: 0.60 x 10^-6 g / 241.06 g/mol ≈ 2.49 x 10^-9 mol. Finally, multiply by Avogadro's number (6.022 x 10^23 atoms/mol): 2.49 x 10^-9 mol x 6.022 x 10^23 atoms/mol ≈ 1.5 x 10^15 atoms.

Question 16

Which contains the most bromine by mass?

Accepted Answer

CBr₄ contains four bromine atoms, which is the highest number of bromine atoms among the given compounds, resulting in the highest bromine mass percentage.

Question 17

Iron has four naturally occurring isotopes, one of which is far more abundant that the others.Iron has an average atomic mass of 55.845 amu.Which isotope is most abundant?

Accepted Answer

The isotope with an atomic mass closest to the average atomic mass of iron (55.845 amu) is most likely to be the most abundant. Option B, with an atomic mass of 55.9349 amu, is the closest to this average, indicating it is the most abundant isotope of iron listed.

Question 18

The average atomic mass of silver is 107.868 amu.Silver has two naturally occurring isotopes, ¹⁰⁷Ag (106.905 amu, 51.839%) and ¹⁰⁹Ag.What is the isotopic mass of ¹⁰⁹Ag?

Accepted Answer

The isotopic mass of $^{109}Ag$ can be calculated using the formula for average atomic mass: $\text{average atomic mass} = (f_1 \times m_1) + (f_2 \times m_2)$, where $f$ represents the fractional abundance and $m$ represents the isotopic mass. Rearranging to solve for $m_2$ (the mass of $^{109}Ag$) and substituting the given values, we find that $m_2 = 108.91$ amu.

Question 19

Weapons-grade plutonium consists of 93% Pu-239 239.0522 amu), with the remainder being Pu-40 (240.0538 amu).What is the average atomic mass of this sample of weapons-grade plutonium? Assume the percentages are exact.

Accepted Answer

The answer of Weapons-grade plutonium consists of 93% Pu-239 239.0522...

Question 20

Calculate the number of hydrogen atoms in 0.25 mol of strychnine, C₂₁H₂₂N₂O₂.

Accepted Answer

Strychnine has 22 hydrogen atoms per molecule. In 0.25 mol of strychnine, there are 0.25 x 6.022 x 10^23 molecules. Therefore, the number of hydrogen atoms is 0.25 x 6.022 x 10^23 x 22 = 3.3 x 10^24 atoms.

Quiz 2: Atoms, Ions, and Molecules the Building Blocks of Matter

A 1.5 g tablet for pain might contain 0.30 g acetaminophen C₈H₉NO₂, 151.16 g/mol) and 0.044 g codeine (C₁₈H₂₁NO₃, 299.36 g/mol) .Calculate the number of moles of codeine in the tablet.

What is the mass of one ozone molecule, O₃, in grams? Round your answer to two significant figures.(1 amu = 1.6605 *10^-27 kg)

Cyanidin chloride (C₁₅H₁₁O₆Cl, 322.7 (g/mol) contains the cyanidin ion, a pigment found in many berries.Calculate the number of moles of cyanidin chloride equivalent to 7.2 mg.

A 1.5 g tablet for pain might contain 0.30 g acetaminophen (C₈H₉NO₂, 151.16 g/mol) and 0.044 g codeine (C₁₈H₂₁NO₃, 299.36 g/mol) .Calculate the number of moles of acetaminophen in the tablet.

Suppose you were given one gold atom every second since the big bang occurred about 14 billion years ago (1.4 * 10¹⁰years) .How many moles of gold atoms would you have?

TNT, or trinitrotoluene, has the chemical formula C₇H₅N₃O₆.How many grams of nitrogen are present in 25 g TNT (227.13 g/mol) ?

Two inorganic blue pigments are Han blue (BaCuSi₄O₁₀) and Egyptian blue (CaCuSi₄O₁₀) _. Which has a higher molar mass and by how much?

Which statement is true about the mole and molar mass?

Iron can form two ionic compounds with sulfur, one containing Fe²⁺ and the other containing Fe³⁺.What is the difference in their formula unit masses?

Highly enriched weapons-grade uranium might consist of exactly 90% U-235 (235.044 amu) , with the remainder being U-238 (238.051 amu) .What is the average atomic mass of this sample of highly enriched uranium? Assume the percentages are exact.

Antirrhinin chloride (C₂₇H₁₁O₆Cl, 630.97 g/mol) contains the antirrhinin ion, a pigment found in açai berries.Calculate the number of moles of carbon in 1.5 g of antirrhinin chloride.

The average atomic mass of lithium is 6.941 amu.Lithium has two naturally occurring isotopes, ⁶Li (7.52%) and ⁷Li (92.48%) .The mass of ⁶Li is 6.0151 amu.What is the isotopic mass of ⁷Li?

How many hydrogen atoms are in 102 amu of pure ammonia (NH₃) ?

Calculate the number of molecules in 0.25 mol of strychnine, C₂₁H₂₂N₂O₂.

Calculate the number of americium-241 atoms present in a smoke alarm containing 0.60 $\mu$ g of radioactive ²⁴¹Am (241.06 g/mol) .

Which contains the most bromine by mass?

Iron has four naturally occurring isotopes, one of which is far more abundant that the others.Iron has an average atomic mass of 55.845 amu.Which isotope is most abundant?

The average atomic mass of silver is 107.868 amu.Silver has two naturally occurring isotopes, ¹⁰⁷Ag (106.905 amu, 51.839%) and ¹⁰⁹Ag.What is the isotopic mass of ¹⁰⁹Ag?

Weapons-grade plutonium consists of 93% Pu-239 239.0522 amu) , with the remainder being Pu-40 (240.0538 amu) .What is the average atomic mass of this sample of weapons-grade plutonium? Assume the percentages are exact.

Calculate the number of hydrogen atoms in 0.25 mol of strychnine, C₂₁H₂₂N₂O₂.

Quiz 2: Atoms, Ions, and Molecules the Building Blocks of Matter

A 1.5 g tablet for pain might contain 0.30 g acetaminophen C8H9NO2, 151.16 g/mol) and 0.044 g codeine (C18H21NO3, 299.36 g/mol) .Calculate the number of moles of codeine in the tablet.

What is the mass of one ozone molecule, O3, in grams? Round your answer to two significant figures.(1 amu = 1.6605 *10-27 kg)

Cyanidin chloride (C15H11O6Cl, 322.7 (g/mol) contains the cyanidin ion, a pigment found in many berries.Calculate the number of moles of cyanidin chloride equivalent to 7.2 mg.

A 1.5 g tablet for pain might contain 0.30 g acetaminophen (C8H9NO2, 151.16 g/mol) and 0.044 g codeine (C18H21NO3, 299.36 g/mol) .Calculate the number of moles of acetaminophen in the tablet.

Suppose you were given one gold atom every second since the big bang occurred about 14 billion years ago (1.4 * 1010 years) .How many moles of gold atoms would you have?

TNT, or trinitrotoluene, has the chemical formula C7H5N3O6.How many grams of nitrogen are present in 25 g TNT (227.13 g/mol) ?

Two inorganic blue pigments are Han blue (BaCuSi4O10) and Egyptian blue (CaCuSi4O10) . Which has a higher molar mass and by how much?

Which statement is true about the mole and molar mass?

Iron can form two ionic compounds with sulfur, one containing Fe2+ and the other containing Fe3+.What is the difference in their formula unit masses?

Highly enriched weapons-grade uranium might consist of exactly 90% U-235 (235.044 amu) , with the remainder being U-238 (238.051 amu) .What is the average atomic mass of this sample of highly enriched uranium? Assume the percentages are exact.

Antirrhinin chloride (C27H11O6Cl, 630.97 g/mol) contains the antirrhinin ion, a pigment found in açai berries.Calculate the number of moles of carbon in 1.5 g of antirrhinin chloride.

The average atomic mass of lithium is 6.941 amu.Lithium has two naturally occurring isotopes, 6Li (7.52%) and 7Li (92.48%) .The mass of 6Li is 6.0151 amu.What is the isotopic mass of 7Li?

How many hydrogen atoms are in 102 amu of pure ammonia (NH3) ?

Calculate the number of molecules in 0.25 mol of strychnine, C21H22N2O2.

Calculate the number of americium-241 atoms present in a smoke alarm containing 0.60 μ\muμ g of radioactive 241Am (241.06 g/mol) .

Which contains the most bromine by mass?

Iron has four naturally occurring isotopes, one of which is far more abundant that the others.Iron has an average atomic mass of 55.845 amu.Which isotope is most abundant?

The average atomic mass of silver is 107.868 amu.Silver has two naturally occurring isotopes, 107Ag (106.905 amu, 51.839%) and 109Ag.What is the isotopic mass of 109Ag?

Weapons-grade plutonium consists of 93% Pu-239 239.0522 amu) , with the remainder being Pu-40 (240.0538 amu) .What is the average atomic mass of this sample of weapons-grade plutonium? Assume the percentages are exact.

Calculate the number of hydrogen atoms in 0.25 mol of strychnine, C21H22N2O2.

A 1.5 g tablet for pain might contain 0.30 g acetaminophen C₈H₉NO₂, 151.16 g/mol) and 0.044 g codeine (C₁₈H₂₁NO₃, 299.36 g/mol) .Calculate the number of moles of codeine in the tablet.

What is the mass of one ozone molecule, O₃, in grams? Round your answer to two significant figures.(1 amu = 1.6605 *10^-27 kg)

Cyanidin chloride (C₁₅H₁₁O₆Cl, 322.7 (g/mol) contains the cyanidin ion, a pigment found in many berries.Calculate the number of moles of cyanidin chloride equivalent to 7.2 mg.

A 1.5 g tablet for pain might contain 0.30 g acetaminophen (C₈H₉NO₂, 151.16 g/mol) and 0.044 g codeine (C₁₈H₂₁NO₃, 299.36 g/mol) .Calculate the number of moles of acetaminophen in the tablet.

Suppose you were given one gold atom every second since the big bang occurred about 14 billion years ago (1.4 * 10¹⁰years) .How many moles of gold atoms would you have?

TNT, or trinitrotoluene, has the chemical formula C₇H₅N₃O₆.How many grams of nitrogen are present in 25 g TNT (227.13 g/mol) ?

Two inorganic blue pigments are Han blue (BaCuSi₄O₁₀) and Egyptian blue (CaCuSi₄O₁₀) _. Which has a higher molar mass and by how much?

Iron can form two ionic compounds with sulfur, one containing Fe²⁺ and the other containing Fe³⁺.What is the difference in their formula unit masses?

Antirrhinin chloride (C₂₇H₁₁O₆Cl, 630.97 g/mol) contains the antirrhinin ion, a pigment found in açai berries.Calculate the number of moles of carbon in 1.5 g of antirrhinin chloride.

The average atomic mass of lithium is 6.941 amu.Lithium has two naturally occurring isotopes, ⁶Li (7.52%) and ⁷Li (92.48%) .The mass of ⁶Li is 6.0151 amu.What is the isotopic mass of ⁷Li?

How many hydrogen atoms are in 102 amu of pure ammonia (NH₃) ?

Calculate the number of molecules in 0.25 mol of strychnine, C₂₁H₂₂N₂O₂.

Calculate the number of americium-241 atoms present in a smoke alarm containing 0.60 $\mu$ g of radioactive ²⁴¹Am (241.06 g/mol) .

The average atomic mass of silver is 107.868 amu.Silver has two naturally occurring isotopes, ¹⁰⁷Ag (106.905 amu, 51.839%) and ¹⁰⁹Ag.What is the isotopic mass of ¹⁰⁹Ag?

Calculate the number of hydrogen atoms in 0.25 mol of strychnine, C₂₁H₂₂N₂O₂.