Combustion of a 0.9835-g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900 g of CO2 and 1.070 g of H2O. What is the empirical formula of the compound?

A) C2 H5O B) C4 H10O2 C) C4 H11O2 D) C4 H10O E) C2 H5O2 A) C2 H5O B) C4 H10O2 C) C4 H11O2 D) C4 H10O E) C2 H5O2

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO3 (s)→ PbO (s)+ CO2 (g) If the reaction yield is 95.7%, how many grams of lead (II)oxide will be produced by the decomposition of 2.50 g of lead (II)carbonate?

A) 1.04 B) 1.55 C) 2.09 D) 4.00 E) 5.55 A) 1.04 B) 1.55 C) 2.09 D) 4.00 E) 5.55

The molecular weight of the acetic acid (CH3CO2H), rounded to the nearest integer, is __________ amu.

A) 60 B) 48 C) 44 D) 32 A) 60 B) 48 C) 44 D) 32

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s)+ 3 O2 (g)→ 2 Al2O3 (s) The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is __________ g.

A) 9.4 B) 7.4 C) 4.7 D) 5.3 E) 5.0 A) 9.4 B) 7.4 C) 4.7 D) 5.3 E) 5.0

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s)+ H2O (l)→ Ca(OH)2 (s) A 4.00-g sample of CaO is reacted with 3.86 g of H2O. How many grams of water remains after completion of reaction?

A) 0.00 B) 0.00793 C) 2.57 D) 1.04 E) 0.143 A) 0.00 B) 0.00793 C) 2.57 D) 1.04 E) 0.143

A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water. Mg3N2 + 3 H2O → 2NH3 + 3MgO The yield of MgO is 3.60 g. What is the percent yield in the reaction?

A) 94.5 B) 78.4 C) 46.6 D) 49.4 E) 99.9 A) 94.5 B) 78.4 C) 46.6 D) 49.4 E) 99.9

The total number of atoms in 0.111 mol of Fe(CO)3(PH3)2 is __________.

A) 15.0 B) 1.00 × 1024 C) 4.46 × 1021 D) 1.67 E) 2.76 × 10-24 A) 15.0 B) 1.00 × 1024 C) 4.46 × 1021 D) 1.67 E) 2.76 × 10-24

Which of the following are decomposition reactions? 1)CH4 (g)+ O2 (g)→ CO2 (g)+ H2O (l) 2)CaO (s)+ CO2 (g)→ CaCO3 (s) 3)Mg (s)+ O2 (g)→ MgO (s) 4)PbCO3 (s)→ PbO (s)+ CO2 (g)

A) 1, 2, and 3 B) 4 only C) 1, 2, 3, and 4 D) 2 and 3 E) 2, 3, and 4 A) 1, 2, and 3 B) 4 only C) 1, 2, 3, and 4 D) 2 and 3 E) 2, 3, and 4

How many oxygen atoms are contained in 2.74 g of Al2(SO4)3?

A) 12 B) 6.02 × 1023 C) 7.22 × 1024 D) 5.79 × 1022 E) 8.01 × 10-3 A) 12 B) 6.02 × 1023 C) 7.22 × 1024 D) 5.79 × 1022 E) 8.01 × 10-3

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

Combustion of a 0.9835-g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900 g of CO₂ and 1.070 g of H₂O. What is the empirical formula of the compound?

(Multiple Choice)

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Question 141

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO₃ (s)→ PbO (s)+ CO₂ (g) If the reaction yield is 95.7%, how many grams of lead (II)oxide will be produced by the decomposition of 2.50 g of lead (II)carbonate?

(Multiple Choice)

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Question 142

The molecular weight of the acetic acid (CH₃CO₂H), rounded to the nearest integer, is __________ amu.

(Multiple Choice)

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Question 143

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 30.00 gram sample of the alcohol produced 57.30 grams of CO₂ and 35.22 grams of H₂O. What is the empirical formula of the alcohol?

(Short Answer)

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Question 144

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 145

Calculate the percentage by mass of nitrogen in PtCl₂(NH₃)₂.

(Multiple Choice)

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Question 146

When the following equation is balanced, the coefficients are __________. C₈H₁₈ + O₂ → CO₂ + H₂O

(Multiple Choice)

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Question 147

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s)+ 3 O₂ (g)→ 2 Al₂O₃ (s) The maximum amount of Al₂O₃ that can be produced from 2.5 g of Al and 2.5 g of O₂ is __________ g.

(Multiple Choice)

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Question 148

When the following equation is balanced, the coefficient of oxygen is __________. PbS (s)+ O₂ (g)→ PbO (s)+ SO₂ (g)

(Multiple Choice)

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Question 149

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s)+ H₂O (l)→ Ca(OH)₂ (s) A 4.00-g sample of CaO is reacted with 3.86 g of H₂O. How many grams of water remains after completion of reaction?

(Multiple Choice)

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Question 150

When the following equation is balanced, the coefficients are __________. Al(NO₃)₃ + Na₂S → Al₂S₃ + NaNO₃

(Multiple Choice)

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Question 151

The balanced equation for the decomposition of sodium azide is __________.

(Multiple Choice)

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Question 152

One mole of __________ contains the smallest number of atoms.

(Multiple Choice)

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Question 153

A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is 60.05 amu. The molecular formula of this compound is __________.

(Multiple Choice)

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Question 154

A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water. Mg₃N₂ + 3 H₂O → 2NH₃ + 3MgO The yield of MgO is 3.60 g. What is the percent yield in the reaction?

(Multiple Choice)

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Question 155

The total number of atoms in 0.111 mol of Fe(CO)₃(PH₃)₂ is __________.

(Multiple Choice)

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Question 156

Which of the following are decomposition reactions? 1)CH₄ (g)+ O₂ (g)→ CO₂ (g)+ H₂O (l) 2)CaO (s)+ CO₂ (g)→ CaCO₃ (s) 3)Mg (s)+ O₂ (g)→ MgO (s) 4)PbCO₃ (s)→ PbO (s)+ CO₂ (g)

(Multiple Choice)

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Question 157

A compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass. What is the empirical formula of the compound?

(Multiple Choice)

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Question 158

How many oxygen atoms are contained in 2.74 g of Al₂(SO₄)₃?

(Multiple Choice)

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Question 159

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

(Multiple Choice)

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Question 160

Showing 141 - 160 of 170

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

Combustion of a 0.9835-g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900 g of CO2 and 1.070 g of H2O. What is the empirical formula of the compound?

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO3 (s)→ PbO (s)+ CO2 (g) If the reaction yield is 95.7%, how many grams of lead (II)oxide will be produced by the decomposition of 2.50 g of lead (II)carbonate?

The molecular weight of the acetic acid (CH3CO2H), rounded to the nearest integer, is __________ amu.

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 30.00 gram sample of the alcohol produced 57.30 grams of CO2 and 35.22 grams of H2O. What is the empirical formula of the alcohol?

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.

Calculate the percentage by mass of nitrogen in PtCl2(NH3)2.

When the following equation is balanced, the coefficients are __________. C8H18 + O2 → CO2 + H2O

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s)+ 3 O2 (g)→ 2 Al2O3 (s) The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is __________ g.

When the following equation is balanced, the coefficient of oxygen is __________. PbS (s)+ O2 (g)→ PbO (s)+ SO2 (g)

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s)+ H2O (l)→ Ca(OH)2 (s) A 4.00-g sample of CaO is reacted with 3.86 g of H2O. How many grams of water remains after completion of reaction?

When the following equation is balanced, the coefficients are __________. Al(NO3)3 + Na2S → Al2S3 + NaNO3

The balanced equation for the decomposition of sodium azide is __________.

One mole of __________ contains the smallest number of atoms.

A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is 60.05 amu. The molecular formula of this compound is __________.

A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water. Mg3N2 + 3 H2O → 2NH3 + 3MgO The yield of MgO is 3.60 g. What is the percent yield in the reaction?

The total number of atoms in 0.111 mol of Fe(CO)3(PH3)2 is __________.

Which of the following are decomposition reactions? 1)CH4 (g)+ O2 (g)→ CO2 (g)+ H2O (l) 2)CaO (s)+ CO2 (g)→ CaCO3 (s) 3)Mg (s)+ O2 (g)→ MgO (s) 4)PbCO3 (s)→ PbO (s)+ CO2 (g)

A compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass. What is the empirical formula of the compound?

How many oxygen atoms are contained in 2.74 g of Al2(SO4)3?

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

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Combustion of a 0.9835-g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900 g of CO₂ and 1.070 g of H₂O. What is the empirical formula of the compound?

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO₃ (s)→ PbO (s)+ CO₂ (g) If the reaction yield is 95.7%, how many grams of lead (II)oxide will be produced by the decomposition of 2.50 g of lead (II)carbonate?

The molecular weight of the acetic acid (CH₃CO₂H), rounded to the nearest integer, is __________ amu.

A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 30.00 gram sample of the alcohol produced 57.30 grams of CO₂ and 35.22 grams of H₂O. What is the empirical formula of the alcohol?

Calculate the percentage by mass of nitrogen in PtCl₂(NH₃)₂.

When the following equation is balanced, the coefficients are __________. C₈H₁₈ + O₂ → CO₂ + H₂O

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s)+ 3 O₂ (g)→ 2 Al₂O₃ (s) The maximum amount of Al₂O₃ that can be produced from 2.5 g of Al and 2.5 g of O₂ is __________ g.

When the following equation is balanced, the coefficient of oxygen is __________. PbS (s)+ O₂ (g)→ PbO (s)+ SO₂ (g)

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s)+ H₂O (l)→ Ca(OH)₂ (s) A 4.00-g sample of CaO is reacted with 3.86 g of H₂O. How many grams of water remains after completion of reaction?

When the following equation is balanced, the coefficients are __________. Al(NO₃)₃ + Na₂S → Al₂S₃ + NaNO₃

A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water. Mg₃N₂ + 3 H₂O → 2NH₃ + 3MgO The yield of MgO is 3.60 g. What is the percent yield in the reaction?

The total number of atoms in 0.111 mol of Fe(CO)₃(PH₃)₂ is __________.

Which of the following are decomposition reactions? 1)CH₄ (g)+ O₂ (g)→ CO₂ (g)+ H₂O (l) 2)CaO (s)+ CO₂ (g)→ CaCO₃ (s) 3)Mg (s)+ O₂ (g)→ MgO (s) 4)PbCO₃ (s)→ PbO (s)+ CO₂ (g)

How many oxygen atoms are contained in 2.74 g of Al₂(SO₄)₃?

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