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Stoichiometry Review

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Question 1. Balance the following equation and choose the quantity which is the sum of the coefficients of the products. ____ SnS 2 + ____ HCl ___ H 2 SnCl 6 + ____ H 2 S a) 8 b) 5 c) 3 d) 6 e) 7

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Question 1. Balance the following equation and choose the quantity which is the sum of the coefficients of the products. ____ SnS 2 + ____ HCl ___ H 2 SnCl 6 + ____ H 2 S a) 8 b) 5 c) 3 d) 6 e)

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Question 2. Balance the following equation. What is the sum of the coefficients of the reactants and products? ____ CoO + ____ O 2 ____ Co 2 O 3 a ) 9 b) 3 c) 7 d) 6 e) 8

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Question 2. Balance the following equation. What is the sum of the coefficients of the reactants and products? ____ CoO + ____ O 2 ____ Co 2 O 3 a ) 9 b) 3 c) 7 d) 6 e) 8 412

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Question 3. Balance the following equation for the combustion of octane. What is the sum of the coefficients of the reactants and products? ____ C 8 H 18 + ____ O 2 ____ CO 2 + ____ H 2 O a) 30 b) 61 c) 52 d) 43 e) 39

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Question 3. Balance the following equation for the combustion of octane. What is the sum of the coefficients of the reactants and products? ____ C 8 H 18 + ____ O 2 ____ CO 2 + ____ H 2 O a) 30 b) 61 c) 52 d) 43 e)

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Question 4. Calculate the number of moles of N 2 produced from moles of NH 3 by the following reaction. 4 NH NO 5 N H 2 O a) 0.02 b) 0.50 c) 0.08 d) 0.10 e) 0.64

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Question 4. Calculate the number of moles of N 2 produced from moles of NH 3 by the following reaction. 4 NH NO 5 N H 2 O a) 0.02 b) 0.50 c) 0.08 d) 0.10 e) mol ? mol mol NH 3 x 5 moles N 2 4 moles NH 3

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Question 5. Phosgene was used in WW1 as a war gas. It reacts with water in the lungs to produce HCl which causes severe lung damage and ultimately leads to death. How many grams of HCl are produced when 11.0 g of CO 2 are simultaneously formed? (C = 12.01, O = 16.00, H = 1.008, Cl = 35.45). COCl 2 + H 2 O 2 HCl + CO 2 a ) 27.3 b) 36.4 c) 9.11 d) 18.2 e) 0.25

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Question 5. Phosgene was used in WW1 as a war gas. It reacts with water in the lungs to produce HCl which causes severe lung damage and ultimately leads to death. How many grams of HCl are produced when 11.0 g of CO 2 are simultaneously formed? (C = 12.01, O = 16.00, H = 1.008, Cl = 35.45). COCl 2 + H 2 O 2 HCl + CO 2 a ) 27.3 b) 36.4 c) 9.11 d) 18.2 e) g CO 2 x 1 mol CO 2 x 2 mol HCl x g g 1 mol CO 2 1 mol

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Question 6. Calculate the number of moles of Na 2 CS 3 produced from 0.6 moles of CS 2 by the following reaction. 3 CS NaOH 2 Na 2 CS 3 + Na 2 CO H 2 O a) 0.2 b) 0.4 c) 0.8 d) 0.6 e) 0.9

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Question 6. Calculate the number of moles of Na 2 CS 3 produced from 0.6 moles of CS 2 by the following reaction. 3 CS NaOH 2 Na 2 CS 3 + Na 2 CO H 2 O a) 0.2 b) 0.4 c) 0.8 d) 0.6 e) mol CS 2 x 2 moles N 2 3 moles NH 3

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Question 7. A sample of lime, CaO, weighing 69 g was prepared by heating 131 g of limestone, CaCO3. What was the percent yield of the reaction? (Atomic weights: Ca = 40.08, C = 12.01, O = 16.00). CaCO 3 CaO + CO 2 a) 97 b) 73 c) 85 d) 94 e) 91

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Question 7. A sample of lime, CaO, weighing 69 g was prepared by heating 131 g of limestone, CaCO3. What was the percent yield of the reaction? (Atomic weights: Ca = 40.08, C = 12.01, O = 16.00). CaCO 3 CaO + CO 2 a) 97 b) 73 c) 85 d) 94 e) g CaCO 3 x 1 mol CaCO 3 x 1 mol CaO x g g 1 mol CaCO 3 1 mol = 73.4 g Theoretical yield % yield =69 g /73.4 g x 100

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Question mL of hydrogen gas at STP would contain how many moles? a) b) c) d) 4.46 e) 224

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Question mL of hydrogen gas at STP would contain how many moles? a) b) c) d) 4.46 e) mL x 1 L x 1 mol 1000 mL22.4 L

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Question 9. For the reaction: N 2 H O 2 2 H 2 O + NO kJ What is the energy released when 4.60 g if NO 2 is produced? a) 40.0 kJ b) 18.0 kJ c) kJ d) kJ

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Question 9. For the reaction: N 2 H O 2 2 H 2 O + NO kJ What is the energy released when 4.60 g if NO 2 is produced? a) 40.0 kJ b) 18.0 kJ c) kJ d) kJ 4.60 g NO 2 x 1 mol NO 2 x 400 kJ 46.0 g 1 mol NO 2

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Question 10. What is the mass of a sample of C 3 H 8 gas of it occupies 100. mL at STP? a) b) c) 5.09 d) 19.6 e) 196

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Question 10. What is the mass of a sample of C 3 H 8 gas of it occupies 100. mL at STP? a) b) c) 5.09 d) 19.6 e) mL x 1 L x 1 mol x 44.0 g 1000 mL22.4 L 1 mol

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