Question 1

How many grams are present in 0.885 moles of manganese?

Accepted Answer

A)  62.1 g
B)  48.6 g
C)  21.5 g
D)  27.5 g
E)  0.016 g

Question 2

How many grams are contained in a 0.893 mol sample of methane, CH4?

Accepted Answer

A)  1.48 × 10−24 g
B)  5.38 × 1023 g
C)  8.64 × 1024 g
D)  14.3 g
E)  18.0 g

Question 3

Five vials each contain 12 grams of a solid metal sample.The samples include calcium, platinum, barium, gold, and silver.Which vial has the most metal atoms?

Accepted Answer

A)  Calcium
B)  Barium
C)  Gold
D)  Silver
E)  Platinum

Question 4

How many nitrate ions are in 24.4 grams of Ca(NO3) 2?

Accepted Answer

A)  1.79 × 1023 nitrate ions
B)  0.149 nitrate ions
C)  1.47 × 1025 nitrate ions
D)  8.95 × 1022 nitrate ions
E)  0.297 nitrate ions

Question 5

How many moles are in 8.73 × 1025 atoms of boron, B?

Accepted Answer

A)  145 moles
B)  3.84 × 1027 moles
C)  1.45 moles
D)  5.04 × 10−25 moles
E)  6.90 × 10−3 moles

Question 6

The density of water is 1.00 g/mL at 4°C.How many water molecules are present in 6.25 mL of water at this temperature? (NA = 6.022 × 1023 mol−1)

Accepted Answer

A)  6.27 × 1023 molecules
B)  3.76 × 1024 molecules
C)  2.09 × 1023 molecules
D)  6.02 × 1023 molecules
E)  0.347 molecules

Question 7

What is the percent carbon in CH3CH2OH?

Accepted Answer

A)  13%
B)  26%
C)  35%
D)  46%
E)  52%

Question 8

Five vials each contain 12 grams of a solid metal sample.The samples include calcium, platinum, barium, gold, and silver.Which vial has the fewest moles of metal atoms?

Accepted Answer

A)  Calcium
B)  Barium
C)  Gold
D)  Silver
E)  Platinum

Question 9

Calculate the molecular mass of menthol, C10H20O.

Accepted Answer

A)  156 amu
B)  140 amu
C)  29 amu
D)  146 amu
E)  136 amu

Question 10

How many moles of ammonia, NH3, are in 13.81 g of NH3?

Accepted Answer

A)  1.234 moles
B)  0.8107 moles
C)  8.316 × 1024 moles
D)  4.881 × 1023 moles
E)  235.3 moles

Question 11

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) 2.

Accepted Answer

A)  3.28 mol
B)  2.32 mol
C)  0.431 mol
D)  0.305 mol
E)  0.200 mol

Question 12

What is the average mass, in grams, of one atom of iron? (NA = 6.022 × 1023 mol−1)

Accepted Answer

A)  6.02 × 1023 g
B)  1.66 × 10−24 g
C)  9.27 × 10−23 g
D)  55.85 g
E)  55.85 × 10−23 g

Question 13

Calculate the molecular mass of tetraphosphorus decaoxide, P4O10, a corrosive substance which can be used as a drying agent.

Accepted Answer

A)  469.73 amu
B)  283.88 amu
C)  190.97 amu
D)  139.88 amu
E)  94.97 amu

Question 14

A compound is found to be 73.03% C, 6.13% H, and 20.84% O by mass.What is the empirical formula of the compound?

Accepted Answer

A)  C6H6O
B)  CHO
C)  C2H2O
D)  C14H14O3
E)  C11HO3

Question 15

Calculate the formula mass of potassium permanganate, KMnO4.

Accepted Answer

A)  149.91 amu
B)  79.41 amu
C)  127.41 amu
D)  158.04 amu
E)  174.04 amu

Question 16

Proteins found in humans are polymers that consist of different combinations of 20 amino acids.Proline, one of the 20 amino acids, has the molecular formula, C5H9NO2.If a human protein has 25 proline monomers, how many carbon atoms from proline are present in the protein?

Accepted Answer

A)  4 C atoms
B)  25 C atoms
C)  40 C atoms
D)  100 C atoms
E)  125 C atoms

Question 17

What is the mass of one copper atom? (NA = 6.022 × 1023 mol−1)

Accepted Answer

A)  1.055 × 10−22 g
B)  63.55 g
C)  1 amu
D)  1.66 × 10−24 g
E)  9.476 × 1021 g

Question 18

Calculate the formula mass of rubidium carbonate, Rb2CO3.

Accepted Answer

A)  340.43 amu
B)  255.00 amu
C)  230.95 amu
D)  145.47 amu
E)  113.48 amu

Question 19

A compound is found to be 15.65% H and 31.07% N, with the remainder from carbon, by mass.Determine the empirical formula of the compound.

Accepted Answer

A)  N4C7H2
B)  NC2H7
C)  NC2H8
D)  N2CH3
E)  NCH5

Question 20

How many moles are present in 17.4 g of lead?

Accepted Answer

A)  0.0994 moles
B)  1.05 × 1025 moles
C)  0.0840 moles
D)  10.06 moles
E)  11.9 moles

Exam 5: The Mole and Chemical Formulas

Five vials each contain 12 grams of a solid metal sample.The samples include calcium, platinum, barium, gold, and silver.Which vial has the most metal atoms?

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Calculate the molecular mass of menthol, C10H20O.

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A compound is found to be 15.65% H and 31.07% N, with the remainder from carbon, by mass.Determine the empirical formula of the compound.

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Five vials each contain 12 grams of a solid metal sample.The samples include calcium, platinum, barium, gold, and silver.Which vial has the fewest moles of metal atoms?

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How many grams are present in 0.885 moles of manganese?

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What is the average mass, in grams, of one atom of iron? (NA = 6.022 × 1023 mol−1)

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How many moles of ammonia, NH3, are in 13.81 g of NH3?

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What is the percent carbon in CH3CH2OH?

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How many grams are contained in a 0.893 mol sample of methane, CH4?

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Calculate the formula mass of rubidium carbonate, Rb2CO3.

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How many moles are present in 17.4 g of lead?

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A compound is found to be 73.03% C, 6.13% H, and 20.84% O by mass.What is the empirical formula of the compound?

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Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) 2.

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Calculate the formula mass of potassium permanganate, KMnO4.

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Proteins found in humans are polymers that consist of different combinations of 20 amino acids.Proline, one of the 20 amino acids, has the molecular formula, C5H9NO2.If a human protein has 25 proline monomers, how many carbon atoms from proline are present in the protein?

Correct AnswerverifiedShow Answer

Calculate the molecular mass of tetraphosphorus decaoxide, P4O10, a corrosive substance which can be used as a drying agent.

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How many nitrate ions are in 24.4 grams of Ca(NO3) 2?

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How many moles are in 8.73 × 1025 atoms of boron, B?

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What is the mass of one copper atom? (NA = 6.022 × 1023 mol−1)

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The density of water is 1.00 g/mL at 4°C.How many water molecules are present in 6.25 mL of water at this temperature? (NA = 6.022 × 1023 mol−1)

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Calculate the molecular mass of menthol, C₁₀H₂₀O.

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What is the average mass, in grams, of one atom of iron? (N_A = 6.022 × 10²³ mol⁻¹)

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How many moles of ammonia, NH₃, are in 13.81 g of NH₃?

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What is the percent carbon in CH₃CH₂OH?

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How many grams are contained in a 0.893 mol sample of methane, CH₄?

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Calculate the formula mass of rubidium carbonate, Rb₂CO₃.

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Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH) ₂.

Correct Answer
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Calculate the formula mass of potassium permanganate, KMnO₄.

Correct Answer
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Proteins found in humans are polymers that consist of different combinations of 20 amino acids.Proline, one of the 20 amino acids, has the molecular formula, C₅H₉NO₂.If a human protein has 25 proline monomers, how many carbon atoms from proline are present in the protein?

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Calculate the molecular mass of tetraphosphorus decaoxide, P₄O₁₀, a corrosive substance which can be used as a drying agent.

Correct Answer
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How many nitrate ions are in 24.4 grams of Ca(NO₃) ₂?

Correct Answer
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How many moles are in 8.73 × 10²⁵ atoms of boron, B?

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What is the mass of one copper atom? (N_A = 6.022 × 10²³ mol⁻¹)

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The density of water is 1.00 g/mL at 4°C.How many water molecules are present in 6.25 mL of water at this temperature? (N_A = 6.022 × 10²³ mol⁻¹)

Correct Answer
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