The combustion of ethane produces carbon dioxide and water.

Question

The combustion of ethane produces carbon dioxide and water. If 27.6 g C2H6 are burned in the presence of excess ait (O2) and 76.7 g of carbon dioxide are produced, what is the percent yield?

Answer 1

Balanced equation for complete combustion of ethane.

2C₂H₆ + 7O₂ ==> 4CO₂ + 6H₂O

moles C2H6 burned = 27.6 g x 1 mole/30 g = 0.92 moles

Theoretical yield of  CO2 = 0.92 moles C2H6 x 4 mole CO2/2 mole C2H6 = 1.84 moles CO2

Theoretical mass CO2 = 1.84 moles x 44 g/mole = 80.96 g

% yield = 76.7 g/80.96 g (x100%) = 94.7% yield