Complete combustion of a 0.40-mol sample of a hydrocarbon,CxHy,gives 2.40 mol of CO2 and 1.60 mol of H2O.The molecular formula of the original hydrocarbon is

A) C2H8. B) C6H8. C) C9H16. D) C5H5. E) C4H7. A) C2H8. B) C6H8. C) C9H16. D) C5H5. E) C4H7.

What is the mass in grams of one propene,C3H6,molecule?

A) 6.99× 10-23 g B) 2.53 × 1025 g C) 44.0 g D) 42.0 g E) 1.99 × 10-23 g A) 6.99× 10-23 g B) 2.53 × 1025 g C) 44.0 g D) 42.0 g E) 1.99 × 10-23 g

Which one of the following contains 4.21 × 1024 atoms?

A) 91 g C2H2 B) 168 g O2 C) 56 g CH4 D) 294 g N2 E) 28 g He A) 91 g C2H2 B) 168 g O2 C) 56 g CH4 D) 294 g N2 E) 28 g He

Calculate the number of moles of bromine present in 20.5 mL of Br2(l),whose density is 3.12 g/mL.

A) 2.50 mol B) 0.257 mol C) 0.801 mol D) 0.128 mol E) 0.400 mol A) 2.50 mol B) 0.257 mol C) 0.801 mol D) 0.128 mol E) 0.400 mol

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) What mass of sodium hydroxide is required to precipitate 68.0 g of rhodium(III)hydroxide from a solution containing excess rhodium(III)sulfate?

A) 5.88 g B) 53 g C) 17.6 g D) 204 g E) 68 g A) 5.88 g B) 53 g C) 17.6 g D) 204 g E) 68 g

How many moles of hexachlorobenzene,C6Cl6,are in 5.44 g of C6Cl6?

A) 0.0254 mol B) 1.55 × 103 mol C) 0.0755 mol D) 0.019 mol E) 0.0394 mol A) 0.0254 mol B) 1.55 × 103 mol C) 0.0755 mol D) 0.019 mol E) 0.0394 mol

A sample of 496 g of white phosphorus,P4,contains the same number of atoms as

A) 192 g of ozone (O3). B) 56 g of nitrogen (N2). C) 92 g of sodium. D) 120 g of formaldehyde (CH2O). E) 128 g of oxygen (O2). A) 192 g of ozone (O3). B) 56 g of nitrogen (N2). C) 92 g of sodium. D) 120 g of formaldehyde (CH2O). E) 128 g of oxygen (O2).

Exam 3: Calculations With Chemical Formulas and Equations

Complete combustion of a 0.40-mol sample of a hydrocarbon,C_xH_y,gives 2.40 mol of CO₂ and 1.60 mol of H₂O.The molecular formula of the original hydrocarbon is

(Multiple Choice)

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Question 61

What is the mass in grams of one propene,C₃H₆,molecule?

(Multiple Choice)

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Question 62

Consider the following reaction: 2A + B → 3C + D 3)0 mol A and 2.0 mol B react to form 4.0 mol C.What is the percent yield of this reaction?

(Multiple Choice)

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Question 63

How many moles of silver are contained in 7.00 kg of silver?

(Multiple Choice)

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Question 64

Analysis of a compound showed that it contained 76.0 % fluorine atoms and 24.0 % carbon atoms by mass.What is its empirical formula?

(Multiple Choice)

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Question 65

Which one of the following contains 4.21 × 10²⁴ atoms?

(Multiple Choice)

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Question 66

Which of the following samples contains the smallest number of molecules?

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Question 67

A 4.94-g sample of an oxide of chromium contains 3.06 g of chromium.Calculate the simplest formula for the compound.

(Multiple Choice)

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Question 68

Calculate the number of moles of bromine present in 20.5 mL of Br₂(l),whose density is 3.12 g/mL.

(Multiple Choice)

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Question 69

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to carbon dioxide and water.Equal numbers of moles of CO₂ and H₂O are produced.The hydrocarbon could be

(Multiple Choice)

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Question 70

The empirical formula of butadiene is C₂H₃.An experimental determination of the molar mass of butadiene by a student yields the value of 54 g/mol.What is the molecular formula of butadiene?

(Multiple Choice)

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Question 71

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) What mass of sodium hydroxide is required to precipitate 68.0 g of rhodium(III)hydroxide from a solution containing excess rhodium(III)sulfate?

(Multiple Choice)

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Question 72

A sample of an oxide of antimony (Sb)contained 48.5 g of antimony combined with 15.9 g of oxygen.What is the simplest formula for the oxide?

(Multiple Choice)

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Question 73

How many moles of hexachlorobenzene,C₆Cl₆,are in 5.44 g of C₆Cl₆?

(Multiple Choice)

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Question 74

Calculate the number of moles of O₂ required to react with phosphorus to produce 3.56 g of P₄O₆.(Molar mass P₄O₆ = 219.9 g/mol)

(Multiple Choice)

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Question 75

The analysis of an organic compound showed that it contained 0.630 mol of C,0.0300 mol of H,0.420 mol of O,and 0.210 mol of N.How many nitrogen atoms are there in the empirical formula for this compound?

(Multiple Choice)

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Question 76

2KHCO₃(s)→ K₂CO₃(s)+ CO₂(g)+ H₂O(l) How many moles of potassium carbonate will be produced if 487 g of potassium hydrogen carbonate are heated?

(Multiple Choice)

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Question 77

A compound containing only carbon,hydrogen,and oxygen is subjected to elemental analysis.Upon complete combustion,a 0.7916-g sample of the compound produced 1.581 g of CO₂ and 0.6474 g of H₂O.What is the empirical formula of the compound?

(Multiple Choice)

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Question 78

A sample of 496 g of white phosphorus,P₄,contains the same number of atoms as

(Multiple Choice)

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Question 79

Sorbose,C₆H₁₂O₆,is used in making vitamin C.A sorbose sample containing 36.0 g of carbon atoms also contains ____ g of hydrogen atoms.

(Multiple Choice)

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Question 80

Showing 61 - 80 of 139

Exam 3: Calculations With Chemical Formulas and Equations

Complete combustion of a 0.40-mol sample of a hydrocarbon,CxHy,gives 2.40 mol of CO2 and 1.60 mol of H2O.The molecular formula of the original hydrocarbon is

What is the mass in grams of one propene,C3H6,molecule?

Consider the following reaction: 2A + B → 3C + D 3)0 mol A and 2.0 mol B react to form 4.0 mol C.What is the percent yield of this reaction?

How many moles of silver are contained in 7.00 kg of silver?

Analysis of a compound showed that it contained 76.0 % fluorine atoms and 24.0 % carbon atoms by mass.What is its empirical formula?

Which one of the following contains 4.21 × 1024 atoms?

Which of the following samples contains the smallest number of molecules?

A 4.94-g sample of an oxide of chromium contains 3.06 g of chromium.Calculate the simplest formula for the compound.

Calculate the number of moles of bromine present in 20.5 mL of Br2(l),whose density is 3.12 g/mL.

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to carbon dioxide and water.Equal numbers of moles of CO2 and H2O are produced.The hydrocarbon could be

The empirical formula of butadiene is C2H3.An experimental determination of the molar mass of butadiene by a student yields the value of 54 g/mol.What is the molecular formula of butadiene?

A sample of an oxide of antimony (Sb)contained 48.5 g of antimony combined with 15.9 g of oxygen.What is the simplest formula for the oxide?

How many moles of hexachlorobenzene,C6Cl6,are in 5.44 g of C6Cl6?

Calculate the number of moles of O2 required to react with phosphorus to produce 3.56 g of P4O6.(Molar mass P4O6 = 219.9 g/mol)

The analysis of an organic compound showed that it contained 0.630 mol of C,0.0300 mol of H,0.420 mol of O,and 0.210 mol of N.How many nitrogen atoms are there in the empirical formula for this compound?

2KHCO3(s)→ K2CO3(s)+ CO2(g)+ H2O(l) How many moles of potassium carbonate will be produced if 487 g of potassium hydrogen carbonate are heated?

A compound containing only carbon,hydrogen,and oxygen is subjected to elemental analysis.Upon complete combustion,a 0.7916-g sample of the compound produced 1.581 g of CO2 and 0.6474 g of H2O.What is the empirical formula of the compound?

A sample of 496 g of white phosphorus,P4,contains the same number of atoms as

Sorbose,C6H12O6,is used in making vitamin C.A sorbose sample containing 36.0 g of carbon atoms also contains ____ g of hydrogen atoms.

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Complete combustion of a 0.40-mol sample of a hydrocarbon,C_xH_y,gives 2.40 mol of CO₂ and 1.60 mol of H₂O.The molecular formula of the original hydrocarbon is

What is the mass in grams of one propene,C₃H₆,molecule?

Which one of the following contains 4.21 × 10²⁴ atoms?

Calculate the number of moles of bromine present in 20.5 mL of Br₂(l),whose density is 3.12 g/mL.

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to carbon dioxide and water.Equal numbers of moles of CO₂ and H₂O are produced.The hydrocarbon could be

The empirical formula of butadiene is C₂H₃.An experimental determination of the molar mass of butadiene by a student yields the value of 54 g/mol.What is the molecular formula of butadiene?

How many moles of hexachlorobenzene,C₆Cl₆,are in 5.44 g of C₆Cl₆?

Calculate the number of moles of O₂ required to react with phosphorus to produce 3.56 g of P₄O₆.(Molar mass P₄O₆ = 219.9 g/mol)

2KHCO₃(s)→ K₂CO₃(s)+ CO₂(g)+ H₂O(l) How many moles of potassium carbonate will be produced if 487 g of potassium hydrogen carbonate are heated?

A compound containing only carbon,hydrogen,and oxygen is subjected to elemental analysis.Upon complete combustion,a 0.7916-g sample of the compound produced 1.581 g of CO₂ and 0.6474 g of H₂O.What is the empirical formula of the compound?

A sample of 496 g of white phosphorus,P₄,contains the same number of atoms as

Sorbose,C₆H₁₂O₆,is used in making vitamin C.A sorbose sample containing 36.0 g of carbon atoms also contains ____ g of hydrogen atoms.