Ethane gas,C2H undergoes complete combustion to produce carbon dioxide and water.

Question

Ethane gas,C2H undergoes complete combustion to produce carbon dioxide and water. 2C2H (g) + 7O (g) → 4CO (g) + 6H2O(g) How many moles of H2O would be produced by 1.40 mol of O and sufficient either?

Answer 1

Ethane gas is NOT C₂H. It is C₂H₆, and carbon dioxide is CO₂, not CO. The balanced equation for the combustion of ethane gas is

2C₂H₆ + 7O₂ ==> 4CO₂ + 6H₂O

From this equation you see 6 moles water come from 7 moles oxygen (O₂ not O). Thus, 1.4 moles O₂ x 6 mol H₂O/7 mol O₂ = 1.2 moles H₂O