Determine the molar masses of C_{2}H_{2 }and H_{2}O and then use stoichiometry to determine the mass of H_{2}O needed to produce 13 g C_{2}H_{2}

Step 1. Determine the molar of H_{2}O and C_{2}H_{2}

C_{2}H_{2} **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**

H_{2}O **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**

Calcium carbide (CaC_{2}) reacts with water to produce acetylene (C_{2}H_{2}):

*CaC*_{2}* _{ }(s) + *2

Production of 13 g of C_{2}H_{2} requires consumption of __________ ** g of H_{2}O**.

A. 4.5

B. 9.0

C. 18

D. 4.8 x 10^{2}

E. 26

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