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?

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

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

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

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

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 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

What is the percent carbon in CH3CH2OH?

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

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

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

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

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

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

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

Calculate the molecular mass of menthol, C10H20O.

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

Exam 5: The Mole and Chemical Formulas

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?

(Multiple Choice)

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Question 21

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

(Multiple Choice)

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Question 22

Calculate the formula mass of rubidium carbonate, Rb₂CO₃.

(Multiple Choice)

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Question 23

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

(Multiple Choice)

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Question 24

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?

(Multiple Choice)

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Question 25

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.

(Multiple Choice)

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Question 26

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

(Multiple Choice)

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Question 27

How many grams are present in 0.885 moles of manganese?

(Multiple Choice)

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Question 28

Calculate the formula mass of potassium permanganate, KMnO₄.

(Multiple Choice)

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Question 29

What is the percent carbon in CH₃CH₂OH?

(Multiple Choice)

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Question 30

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?

(Multiple Choice)

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Question 31

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?

(Multiple Choice)

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Question 32

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

(Multiple Choice)

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Question 33

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

(Multiple Choice)

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Question 34

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

(Multiple Choice)

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Question 35

Calculate the molecular mass of menthol, C₁₀H₂₀O.

(Multiple Choice)

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Question 36

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

(Multiple Choice)

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Question 37

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)

(Multiple Choice)

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Question 38

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

(Multiple Choice)

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Question 39

How many moles are present in 17.4 g of lead?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 60

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?

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

Calculate the formula mass of rubidium carbonate, Rb₂CO₃.

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

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?

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.

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

How many grams are present in 0.885 moles of manganese?

Calculate the formula mass of potassium permanganate, KMnO₄.

What is the percent carbon in CH₃CH₂OH?

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?

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?

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

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

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

Calculate the molecular mass of menthol, C₁₀H₂₀O.

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

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)

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

How many moles are present in 17.4 g of lead?

Atoms and Elements

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

Molecular Shape

Solids, Liquids, and Phase Changes

Gases

Physical Properties of Solutions

Chemical Reactions and Chemical Equations

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

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Nuclear Chemistry

Electrochemistry

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Exam 5: The Mole and Chemical Formulas

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?

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

Calculate the formula mass of rubidium carbonate, Rb2CO3.

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

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?

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.

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

How many grams are present in 0.885 moles of manganese?

Calculate the formula mass of potassium permanganate, KMnO4.

What is the percent carbon in CH3CH2OH?

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?

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?

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

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

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

Calculate the molecular mass of menthol, C10H20O.

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

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)

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

How many moles are present in 17.4 g of lead?

Atoms and Elements

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

Molecular Shape

Solids, Liquids, and Phase Changes

Gases

Physical Properties of Solutions

Chemical Reactions and Chemical Equations

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

Biochemistry

Nuclear Chemistry

Electrochemistry

Filters

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?

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

Calculate the formula mass of rubidium carbonate, Rb₂CO₃.

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

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

Calculate the formula mass of potassium permanganate, KMnO₄.

What is the percent carbon in CH₃CH₂OH?

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

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

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

Calculate the molecular mass of menthol, C₁₀H₂₀O.

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

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)

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