What is the percent by mass nitrogen in (NH4)2SO3?

A) 24.1 % B) 12.961 % C) 64.6 % D) 39.3 % E) 4.73 % A) 24.1 % B) 12.961 % C) 64.6 % D) 39.3 % E) 4.73 %

Pure copper may be produced by the reaction of copper(I)sulfide with oxygen gas as follows: Cu2S(s)+ O2(g)→ 2Cu(s)+ SO2(g) What mass of copper(I)sulfide is required in order to prepare 0.100 kg of copper metal?

A) 0.1 kg B) 0.05 kg C) 0.0752 kg D) 0.25 kg E) 0.125 kg A) 0.1 kg B) 0.05 kg C) 0.0752 kg D) 0.25 kg E) 0.125 kg

The hydrocarbon octane has the structural formula CH3(CH2)6CH3.What is the molecular mass of this hydrocarbon?

A) 114.2 amu. B) 0.008754 amu. C) 100.1 amu. D) 0.009984432 amu. E) 124.2 amu. A) 114.2 amu. B) 0.008754 amu. C) 100.1 amu. D) 0.009984432 amu. E) 124.2 amu.

The products of the combustion of acetone with oxygen are shown in the following equation: __ CH3COCH3 + __ O2 → __ CO2 + __ H2O When properly balanced,the equation indicates that ____ mol of O2 are required for each mole of CH3COCH3.

A) 4 B) 6 C) 3.5 D) 7 E) 2 A) 4 B) 6 C) 3.5 D) 7 E) 2

One step in the isolation of pure rhodium metal (Rh)is the precipitation of rhodium(III)hydroxide from a solution containing rhodium(III)sulfate according to the following balanced chemical equation: Rh2(SO4)3(aq)+ 6NaOH(aq)→ 2Rh(OH)3(s)+ 3Na2SO4(aq) If the reaction of 0.500 g of rhodium(III)sulfate with excess sodium hydroxide produces 0.330 g of rhodium(III)hydroxide,what is the percent yield?

A) 423 % B) 211 % C) 52.9 % D) 66 % E) 105 % A) 423 % B) 211 % C) 52.9 % D) 66 % E) 105 %

Nitric oxide,NO,is made from the oxidation of NH3,and the reaction is represented by the equation 4NH3 + 5O2 → 4NO + 6H2O An 8.9-g sample of NH3 gives 12.0 g of NO.The percent yield of NO is .

A) 88 % B) 43 % C) 16 % D) 76 % E) 29 % A) 88 % B) 43 % C) 16 % D) 76 % E) 29 %

A 5.95-g sample of AgNO3 is reacted with BaCl2 according to the equation 2AgNO3(aq)+ BaCl2(aq)→ 2AgCl(s)+ Ba(NO3)2(aq) To give 4.37 g of AgCl.What is the percent yield of AgCl?

A) 58.0 % B) 43.5 % C) 87.1 % D) 73.4 % E) 100 % A) 58.0 % B) 43.5 % C) 87.1 % D) 73.4 % E) 100 %

What is the formula mass of barium phosphate,Ba3(PO4)2?

A) 506.95 amu B) 570.95 amu C) 232.30 amu D) 1013.90 amu E) 601.92 amu A) 506.95 amu B) 570.95 amu C) 232.30 amu D) 1013.90 amu E) 601.92 amu

What is the molar mass of ammonium sulfite,(NH4)2SO3?

A) 98 g/mol B) 116 g/mol C) 55 g/mol D) 180 g/mol E) 84 g/mol A) 98 g/mol B) 116 g/mol C) 55 g/mol D) 180 g/mol E) 84 g/mol

How many moles of pentane,C5H12,are contained in a 31-g sample?

A) 0.52 mol B) 0.43 mol C) 0.74 mol D) 3.9 mol E) 3.1 mol A) 0.52 mol B) 0.43 mol C) 0.74 mol D) 3.9 mol E) 3.1 mol

Exam 3: Calculations With Chemical Formulas and Equations

2Al(s)+ 6HCl(aq)→ 2AlCl₃(aq)+ 3H₂(g) According to the equation above,how many grams of aluminum are needed to completely react with 4.32 mol of hydrochloric acid?

(Multiple Choice)

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Question 21

What is the percent by mass nitrogen in (NH₄)₂SO₃?

(Multiple Choice)

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Question 22

Pure copper may be produced by the reaction of copper(I)sulfide with oxygen gas as follows: Cu₂S(s)+ O₂(g)→ 2Cu(s)+ SO₂(g) What mass of copper(I)sulfide is required in order to prepare 0.100 kg of copper metal?

(Multiple Choice)

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Question 23

The hydrocarbon octane has the structural formula CH₃(CH₂)₆CH₃.What is the molecular mass of this hydrocarbon?

(Multiple Choice)

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Question 24

The products of the combustion of acetone with oxygen are shown in the following equation: CH₃COCH₃ + O₂ → CO₂ + H₂O When properly balanced,the equation indicates that ____ mol of O₂ are required for each mole of CH₃COCH₃.

(Multiple Choice)

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Question 25

An ore sample is found to contain 10.500000 g of cobalt and 87.3 g waste rock (gangue).What is the percent by mass of cobalt in the ore?

(Multiple Choice)

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Question 26

Which of the following compounds contains the largest number of atoms?

(Multiple Choice)

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Question 27

The dicarboxylic acid potassium hydrogen pthalate (shown in the figure)is used to standardize solutions of strong base.What is the molar mass of this compound?

(Multiple Choice)

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Question 28

One step in the isolation of pure rhodium metal (Rh)is the precipitation of rhodium(III)hydroxide from a solution containing rhodium(III)sulfate according to the following balanced chemical equation: Rh₂(SO₄)₃(aq)+ 6NaOH(aq)→ 2Rh(OH)₃(s)+ 3Na₂SO₄(aq) If the reaction of 0.500 g of rhodium(III)sulfate with excess sodium hydroxide produces 0.330 g of rhodium(III)hydroxide,what is the percent yield?

(Multiple Choice)

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Question 29

Nitric oxide,NO,is made from the oxidation of NH₃,and the reaction is represented by the equation 4NH₃ + 5O₂ → 4NO + 6H₂O An 8.9-g sample of NH₃ gives 12.0 g of NO.The percent yield of NO is .

(Multiple Choice)

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Question 30

One step in the isolation of pure rhodium metal (Rh)is the precipitation of rhodium(III)hydroxide from a solution containing rhodium(III)sulfate according to the following balanced chemical equation: Rh₂(SO₄)₃(aq)+ 6NaOH(aq)→ 2Rh(OH)₃(s)+ 3Na₂SO₄(aq) If 3.20 g of rhodium(III)sulfate reacts with excess sodium hydroxide,what mass of rhodium(III)hydroxide may be produced?

(Multiple Choice)

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Question 31

A 5.95-g sample of AgNO₃ is reacted with BaCl₂ according to the equation 2AgNO₃(aq)+ BaCl₂(aq)→ 2AgCl(s)+ Ba(NO₃)₂(aq) To give 4.37 g of AgCl.What is the percent yield of AgCl?

(Multiple Choice)

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Question 32

Which of the following compounds has the highest percentage of nitrogen by mass?

(Multiple Choice)

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Question 33

What is the formula mass of barium phosphate,Ba₃(PO₄)₂?

(Multiple Choice)

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Question 34

A sample containing only carbon,hydrogen,and silicon is subjected to elemental analysis.After complete combustion,a 0.7020-g sample of the compound yields 1.4 g of CO₂,0.86 g of H₂O,and 0.478 g of SiO₂.What is the empirical formula of the compound?

(Multiple Choice)

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Question 35

What is the molar mass of ammonium sulfite,(NH₄)₂SO₃?

(Multiple Choice)

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Question 36

A certain compound has a molar mass of 270 g/mol.Which is a possible empirical formula for this compound?

(Multiple Choice)

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Question 37

How many moles of pentane,C₅H₁₂,are contained in a 31-g sample?

(Multiple Choice)

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Question 38

Styrene's empirical formula is CH.When it is heated to 200°C,it is converted into a polymer,polystyrene,which has excellent insulating properties.What mass of styrene contains 1.77 × 10²¹ molecules of styrene? The molar mass of styrene is 104 g/mol.

(Multiple Choice)

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Question 39

How many molecules are there in 1.54 kg of hydrazine,N₂H₄?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 139

Exam 3: Calculations With Chemical Formulas and Equations

2Al(s)+ 6HCl(aq)→ 2AlCl3(aq)+ 3H2(g) According to the equation above,how many grams of aluminum are needed to completely react with 4.32 mol of hydrochloric acid?

What is the percent by mass nitrogen in (NH4)2SO3?

Pure copper may be produced by the reaction of copper(I)sulfide with oxygen gas as follows: Cu2S(s)+ O2(g)→ 2Cu(s)+ SO2(g) What mass of copper(I)sulfide is required in order to prepare 0.100 kg of copper metal?

The hydrocarbon octane has the structural formula CH3(CH2)6CH3.What is the molecular mass of this hydrocarbon?

The products of the combustion of acetone with oxygen are shown in the following equation: __ CH3COCH3 + __ O2 → __ CO2 + __ H2O When properly balanced,the equation indicates that ____ mol of O2 are required for each mole of CH3COCH3.

An ore sample is found to contain 10.500000 g of cobalt and 87.3 g waste rock (gangue).What is the percent by mass of cobalt in the ore?

Which of the following compounds contains the largest number of atoms?

The dicarboxylic acid potassium hydrogen pthalate (shown in the figure)is used to standardize solutions of strong base.What is the molar mass of this compound?

Nitric oxide,NO,is made from the oxidation of NH3,and the reaction is represented by the equation 4NH3 + 5O2 → 4NO + 6H2O An 8.9-g sample of NH3 gives 12.0 g of NO.The percent yield of NO is .

A 5.95-g sample of AgNO3 is reacted with BaCl2 according to the equation 2AgNO3(aq)+ BaCl2(aq)→ 2AgCl(s)+ Ba(NO3)2(aq) To give 4.37 g of AgCl.What is the percent yield of AgCl?

Which of the following compounds has the highest percentage of nitrogen by mass?

What is the formula mass of barium phosphate,Ba3(PO4)2?

A sample containing only carbon,hydrogen,and silicon is subjected to elemental analysis.After complete combustion,a 0.7020-g sample of the compound yields 1.4 g of CO2,0.86 g of H2O,and 0.478 g of SiO2.What is the empirical formula of the compound?

What is the molar mass of ammonium sulfite,(NH4)2SO3?

A certain compound has a molar mass of 270 g/mol.Which is a possible empirical formula for this compound?

How many moles of pentane,C5H12,are contained in a 31-g sample?

Styrene's empirical formula is CH.When it is heated to 200°C,it is converted into a polymer,polystyrene,which has excellent insulating properties.What mass of styrene contains 1.77 × 1021 molecules of styrene? The molar mass of styrene is 104 g/mol.

How many molecules are there in 1.54 kg of hydrazine,N2H4?

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2Al(s)+ 6HCl(aq)→ 2AlCl₃(aq)+ 3H₂(g) According to the equation above,how many grams of aluminum are needed to completely react with 4.32 mol of hydrochloric acid?

What is the percent by mass nitrogen in (NH₄)₂SO₃?

Pure copper may be produced by the reaction of copper(I)sulfide with oxygen gas as follows: Cu₂S(s)+ O₂(g)→ 2Cu(s)+ SO₂(g) What mass of copper(I)sulfide is required in order to prepare 0.100 kg of copper metal?

The hydrocarbon octane has the structural formula CH₃(CH₂)₆CH₃.What is the molecular mass of this hydrocarbon?

The products of the combustion of acetone with oxygen are shown in the following equation: CH₃COCH₃ + O₂ → CO₂ + H₂O When properly balanced,the equation indicates that ____ mol of O₂ are required for each mole of CH₃COCH₃.

Nitric oxide,NO,is made from the oxidation of NH₃,and the reaction is represented by the equation 4NH₃ + 5O₂ → 4NO + 6H₂O An 8.9-g sample of NH₃ gives 12.0 g of NO.The percent yield of NO is .

A 5.95-g sample of AgNO₃ is reacted with BaCl₂ according to the equation 2AgNO₃(aq)+ BaCl₂(aq)→ 2AgCl(s)+ Ba(NO₃)₂(aq) To give 4.37 g of AgCl.What is the percent yield of AgCl?

What is the formula mass of barium phosphate,Ba₃(PO₄)₂?

A sample containing only carbon,hydrogen,and silicon is subjected to elemental analysis.After complete combustion,a 0.7020-g sample of the compound yields 1.4 g of CO₂,0.86 g of H₂O,and 0.478 g of SiO₂.What is the empirical formula of the compound?

What is the molar mass of ammonium sulfite,(NH₄)₂SO₃?

How many moles of pentane,C₅H₁₂,are contained in a 31-g sample?

Styrene's empirical formula is CH.When it is heated to 200°C,it is converted into a polymer,polystyrene,which has excellent insulating properties.What mass of styrene contains 1.77 × 10²¹ molecules of styrene? The molar mass of styrene is 104 g/mol.

How many molecules are there in 1.54 kg of hydrazine,N₂H₄?