A compound is composed of only C, H, and O. The combustion of a 0.519-g sample of the compound yields 1.24 g of CO2 and 0.255 g of H2O. What is the empirical formula of the compound?

A) C6H6O B) C3H3O C) CH3O D) C2H6O5 E) C2H6O2 A) C6H6O B) C3H3O C) CH3O D) C2H6O5 E) C2H6O2

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O2 (g) → 2MgO (s) How many moles of O2 are consumed when 3.55 mol of magnesium burns?

A) 0.146 B) 0.563 C) 3.55 D) 7.10 E) 1.78 A) 0.146 B) 0.563 C) 3.55 D) 7.10 E) 1.78

Calcium carbide (CaC2)reacts with water to produce acetylene (C2H2): CaC2 (s) + 2H2O (g) → Ca(OH)2 (s) + C2H2 (g) The complete reaction of 57.4 g of CaC2 requires consumption of ________ g of H2O.

A) 0.895 B) 64.1 C) 32.3 D) 1.79 E) 18.0 A) 0.895 B) 64.1 C) 32.3 D) 1.79 E) 18.0

The combustion of propane (C3H8)in the presence of excess oxygen yields CO2 and H2O: C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g) When 2.5 mol of O2 are consumed in their reaction, ________ mol of CO2 are produced.

A) 1.5 B) 3.0 C) 5.0 D) 6.0 E) 2.5 A) 1.5 B) 3.0 C) 5.0 D) 6.0 E) 2.5

The molecular formula of aspartame, the generic name of NutraSweet®, is C14H18N2O5. The molar mass of aspartame, rounded to the nearest integer, is ________ g.

A) 24 B) 156 C) 294 D) 43 E) 39 A) 24 B) 156 C) 294 D) 43 E) 39

How many molecules of CH4 are in 48.2 g of this compound?

A) 5.00 × 1024 B) 3.00 C) 2.90 × 1025 D) 1.81 × 1024 E) 4.00 A) 5.00 × 1024 B) 3.00 C) 2.90 × 1025 D) 1.81 × 1024 E) 4.00

The combustion of propane (C3H8)produces CO2 and H2O: C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g) The reaction of 2.5 mol of O2 with 4.6 mol of C3H8 will produce ________ mol of H2O.

A) 4.0 B) 3.0 C) 2.5 D) 2.0 E) 1.0 A) 4.0 B) 3.0 C) 2.5 D) 2.0 E) 1.0

Pentacarbonyliron (Fe(CO)5)reacts with phosphorous trifluoride (PF3)and hydrogen, releasing carbon monoxide: Fe(CO)5 + PF3 + H2 → Fe(CO)2(PF3)2(H)2 + CO (not balanced) The reaction of 5.0 mol of Fe(CO)5 , 8.0 mol of PF3 and 6.0 mol of H2 will release ________ mol of CO.

A) 15 B) 5.0 C) 24 D) 6.0 E) 12 A) 15 B) 5.0 C) 24 D) 6.0 E) 12

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) In a particular experiment, 2.50-g samples of each reagent are reacted. The theoretical yield of lithium nitride is ________ g.

A) 2.51 B) 2.09 C) 12.5 D) 4.18 E) 6.2 A) 2.51 B) 2.09 C) 12.5 D) 4.18 E) 6.2

The combustion of ammonia in the presence of oxygen yields NO2 and H2O: 4 NH3 (g) + 7O2 (g) → 4 NO2 (g) + 6 H2O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces ________ g of NO2.

A) 212 B) 178 C) 119 D) 0.954 E) 43.9 A) 212 B) 178 C) 119 D) 0.954 E) 43.9

The mass % of F in the binary compound KrF2 is ________.

A) 18.48 B) 45.38 C) 68.80 D) 81.52 E) 31.20 A) 18.48 B) 45.38 C) 68.80 D) 81.52 E) 31.20

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

A compound is composed of only C, H, and O. The combustion of a 0.519-g sample of the compound yields 1.24 g of CO₂ and 0.255 g of H₂O. What is the empirical formula of the compound?

(Multiple Choice)

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Question 121

The mass of a single atom of an element (in amu)is numerically equal to the mass in grams of 1 mole of that element.

(True/False)

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Question 122

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O₂ (g) → 2MgO (s) How many moles of O₂ are consumed when 3.55 mol of magnesium burns?

(Multiple Choice)

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Question 123

Gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.00 L of argon gas at standard conditions?

(Multiple Choice)

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Question 124

Calcium carbide (CaC₂)reacts with water to produce acetylene (C₂H₂): CaC₂ (s) + 2H₂O (g) → Ca(OH)₂ (s) + C₂H₂ (g) The complete reaction of 57.4 g of CaC₂ requires consumption of ________ g of H₂O.

(Multiple Choice)

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Question 125

The combustion of propane (C₃H₈)in the presence of excess oxygen yields CO₂ and H₂O: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g) When 2.5 mol of O₂ are consumed in their reaction, ________ mol of CO₂ are produced.

(Multiple Choice)

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Question 126

The reaction used to inflate automobile airbags ________.

(Multiple Choice)

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Question 127

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO₂ and 70.44 grams of H₂O. What is the empirical formula of the alcohol?

(Short Answer)

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Question 128

The molecular formula of aspartame, the generic name of NutraSweet^®, is C₁₄H₁₈N₂O₅. The molar mass of aspartame, rounded to the nearest integer, is ________ g.

(Multiple Choice)

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Question 129

How many molecules of CH₄ are in 48.2 g of this compound?

(Multiple Choice)

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Question 130

When the following equation is balanced, the coefficient of Al is ________. Al (s) + H₂O (l) → Al(OH)₃ (s) + H₂ (g)

(Multiple Choice)

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Question 131

The combustion of propane (C₃H₈)produces CO₂ and H₂O: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g) The reaction of 2.5 mol of O₂ with 4.6 mol of C₃H₈ will produce ________ mol of H₂O.

(Multiple Choice)

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Question 132

One mole of ________ contains the smallest number of atoms.

(Multiple Choice)

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Question 133

The combustion of propane (C₃H₈)in the presence of excess oxygen yields CO₂ and H₂O: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g) When 7.3 g of C₃H₈ burns in the presence of excess O₂, ________ g of CO₂ is produced.

(Short Answer)

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Question 134

A 22.5-g sample of ammonium carbonate contains ________ mol of ammonium ions.

(Multiple Choice)

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Question 135

Pentacarbonyliron (Fe(CO)₅)reacts with phosphorous trifluoride (PF₃)and hydrogen, releasing carbon monoxide: Fe(CO)₅ + PF₃ + H₂ → Fe(CO)₂(PF₃)₂(H)₂ + CO (not balanced) The reaction of 5.0 mol of Fe(CO)₅ , 8.0 mol of PF₃ and 6.0 mol of H₂ will release ________ mol of CO.

(Multiple Choice)

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Question 136

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N₂ (g) → 2Li₃N (s) In a particular experiment, 2.50-g samples of each reagent are reacted. The theoretical yield of lithium nitride is ________ g.

(Multiple Choice)

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Question 137

The combustion of ammonia in the presence of oxygen yields NO₂ and H₂O: 4 NH₃ (g) + 7O₂ (g) → 4 NO₂ (g) + 6 H₂O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces ________ g of NO₂.

(Multiple Choice)

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Question 138

1 mole of which of the following will contain the largest number of atoms?

(Multiple Choice)

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Question 139

The mass % of F in the binary compound KrF₂ is ________.

(Multiple Choice)

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Question 140

Showing 121 - 140 of 178

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

A compound is composed of only C, H, and O. The combustion of a 0.519-g sample of the compound yields 1.24 g of CO2 and 0.255 g of H2O. What is the empirical formula of the compound?

The mass of a single atom of an element (in amu)is numerically equal to the mass in grams of 1 mole of that element.

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O2 (g) → 2MgO (s) How many moles of O2 are consumed when 3.55 mol of magnesium burns?

Gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.00 L of argon gas at standard conditions?

Calcium carbide (CaC2)reacts with water to produce acetylene (C2H2): CaC2 (s) + 2H2O (g) → Ca(OH)2 (s) + C2H2 (g) The complete reaction of 57.4 g of CaC2 requires consumption of ________ g of H2O.

The combustion of propane (C3H8)in the presence of excess oxygen yields CO2 and H2O: C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g) When 2.5 mol of O2 are consumed in their reaction, ________ mol of CO2 are produced.

The reaction used to inflate automobile airbags ________.

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO2 and 70.44 grams of H2O. What is the empirical formula of the alcohol?

The molecular formula of aspartame, the generic name of NutraSweet®, is C14H18N2O5. The molar mass of aspartame, rounded to the nearest integer, is ________ g.

How many molecules of CH4 are in 48.2 g of this compound?

When the following equation is balanced, the coefficient of Al is ________. Al (s) + H2O (l) → Al(OH)3 (s) + H2 (g)

The combustion of propane (C3H8)produces CO2 and H2O: C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g) The reaction of 2.5 mol of O2 with 4.6 mol of C3H8 will produce ________ mol of H2O.

One mole of ________ contains the smallest number of atoms.

The combustion of propane (C3H8)in the presence of excess oxygen yields CO2 and H2O: C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g) When 7.3 g of C3H8 burns in the presence of excess O2, ________ g of CO2 is produced.

A 22.5-g sample of ammonium carbonate contains ________ mol of ammonium ions.

Pentacarbonyliron (Fe(CO)5)reacts with phosphorous trifluoride (PF3)and hydrogen, releasing carbon monoxide: Fe(CO)5 + PF3 + H2 → Fe(CO)2(PF3)2(H)2 + CO (not balanced) The reaction of 5.0 mol of Fe(CO)5 , 8.0 mol of PF3 and 6.0 mol of H2 will release ________ mol of CO.

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) In a particular experiment, 2.50-g samples of each reagent are reacted. The theoretical yield of lithium nitride is ________ g.

The combustion of ammonia in the presence of oxygen yields NO2 and H2O: 4 NH3 (g) + 7O2 (g) → 4 NO2 (g) + 6 H2O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces ________ g of NO2.

1 mole of which of the following will contain the largest number of atoms?

The mass % of F in the binary compound KrF2 is ________.

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A compound is composed of only C, H, and O. The combustion of a 0.519-g sample of the compound yields 1.24 g of CO₂ and 0.255 g of H₂O. What is the empirical formula of the compound?

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s) + O₂ (g) → 2MgO (s) How many moles of O₂ are consumed when 3.55 mol of magnesium burns?

Calcium carbide (CaC₂)reacts with water to produce acetylene (C₂H₂): CaC₂ (s) + 2H₂O (g) → Ca(OH)₂ (s) + C₂H₂ (g) The complete reaction of 57.4 g of CaC₂ requires consumption of ________ g of H₂O.

The combustion of propane (C₃H₈)in the presence of excess oxygen yields CO₂ and H₂O: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g) When 2.5 mol of O₂ are consumed in their reaction, ________ mol of CO₂ are produced.

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO₂ and 70.44 grams of H₂O. What is the empirical formula of the alcohol?

The molecular formula of aspartame, the generic name of NutraSweet^®, is C₁₄H₁₈N₂O₅. The molar mass of aspartame, rounded to the nearest integer, is ________ g.

How many molecules of CH₄ are in 48.2 g of this compound?

When the following equation is balanced, the coefficient of Al is ________. Al (s) + H₂O (l) → Al(OH)₃ (s) + H₂ (g)

The combustion of propane (C₃H₈)produces CO₂ and H₂O: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g) The reaction of 2.5 mol of O₂ with 4.6 mol of C₃H₈ will produce ________ mol of H₂O.

The combustion of propane (C₃H₈)in the presence of excess oxygen yields CO₂ and H₂O: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g) When 7.3 g of C₃H₈ burns in the presence of excess O₂, ________ g of CO₂ is produced.

Pentacarbonyliron (Fe(CO)₅)reacts with phosphorous trifluoride (PF₃)and hydrogen, releasing carbon monoxide: Fe(CO)₅ + PF₃ + H₂ → Fe(CO)₂(PF₃)₂(H)₂ + CO (not balanced) The reaction of 5.0 mol of Fe(CO)₅ , 8.0 mol of PF₃ and 6.0 mol of H₂ will release ________ mol of CO.

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N₂ (g) → 2Li₃N (s) In a particular experiment, 2.50-g samples of each reagent are reacted. The theoretical yield of lithium nitride is ________ g.

The combustion of ammonia in the presence of oxygen yields NO₂ and H₂O: 4 NH₃ (g) + 7O₂ (g) → 4 NO₂ (g) + 6 H₂O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces ________ g of NO₂.

The mass % of F in the binary compound KrF₂ is ________.