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12.2 Practice Problems

12.2 Practice Problems. 13. Acetylene gas (C 2 H 2 ) is produced by adding water to calcium carbide (CaC 2 ). CaC 2 (s) + 2H 2 O(l)  C 2 H 2 (g) + Ca(OH) 2 (aq) How many grams of acetylene are produced by adding water to 5.00 g CaC 2 ?. g. 2.03. 5 g. 5 g CaC 2. 1. mol CaC 2. 1.

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12.2 Practice Problems

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  1. 12.2 Practice Problems 13. Acetylene gas (C2H2) is produced by adding water to calcium carbide (CaC2). CaC2(s) + 2H2O(l)  C2H2(g) + Ca(OH)2(aq) How many grams of acetylene are produced by adding water to 5.00 g CaC2? g 2.03 5 g 5 g CaC2 1 mol CaC2 1 mol C2H2 g C2H2 26 x x x 1 64 g CaC2 1 mol CaC2 1 mol C2H2 CaC2: Ca: 1 x 40 = 40 C: 2 x 12 = 24 C2H2: C: 2 x 12 = 24 H: 2 x 1 = 2 64 g/mol 26 g/mol 26 x 5 2.03 ) 130 64 130

  2. 12.2 Section Assessment 24. The combustion of acetylene gas is represented by this equation: 2C2H2(g) + 5O2(g)  4CO2(g) + 2H2O(g) How many grams of CO2 and H2O are produced when 52.0 g C2H2 burns in oxygen? 176 g 52.0 g 1 mol C2H2 52.0 g C2H2 4 mol CO2 44 g CO2 x x x 1 26 g C2H2 2 mol C2H2 1 mol CO2 C2H2: C: 2 x 12 = 24 H: 2 x 1 = 2 ---------------------- 26 g/mol CO2: C: 1 x 12 = 12 O: 2 x 16 = 32 ---------------------- 44 g/mol = 176 g CO2

  3. 12.2 Section Assessment 24. The combustion of acetylene gas is represented by this equation: 2C2H2(g) + 5O2(g)  4CO2(g) + 2H2O(g) How many grams of CO2 and H2O are produced when 52.0 g C2H2 burns in oxygen? 176 g 36 g 1 mol C2H2 52.0 g C2H2 2 mol H2O 18 g H2O x x x 1 26 g C2H2 2 mol C2H2 1 mol H2O C2H2: C: 2 x 12 = 24 H: 2 x 1 = 2 ---------------------- 26 g/mol H2O: H: 2 x 1 = 2 O: 1 x 16 = 16 ---------------------- 18 g/mol = 36 g H2O

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