Problem: Calcium carbide (CaC2) reacts with water to produce acetylene (C2H2): CaC2 (s) + 2 H2O (g) → Ca(OH)2 (s) + C2H2 (g)Production of 13 g of C2H2 requires consumption of __________ g of H2O.A. 4.5B. 9.0C. 18D. 4.8 x 102E. 26

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FREE Expert Solution

Determine the molar masses of C2Hand H2O and then use stoichiometry to determine the mass of H2O needed to produce 13 g C2H2

Step 1. Determine the molar of H2O and C2H2

C2H2    2 C × 12.01 g/mol C = 24.02 g/mol  

             2 H × 1.01 g/mol H = 2.02 g/mol

                         Sum = 26.04 g/mol


H2O     1 O × 16 g/mol O = 16 g/mol  

             2 H × 1.01 g/mol H = 2.02 g/mol

                         Sum = 18.02 g/mol

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Problem Details

Calcium carbide (CaC2) reacts with water to produce acetylene (C2H2): 

CaC2 (s) + 2 H2O (g) → Ca(OH)2 (s) + C2H2 (g)

Production of 13 g of C2H2 requires consumption of __________ g of H2O.

A. 4.5
B. 9.0
C. 18
D. 4.8 x 102
E. 26