Question

The combustion of 38.5g of C2H6 with excess oxygen. Find the equation, balance equation and find the mass of each product

Answer 1

2C2H6 + 7O2 ==> 4CO2 + 6H2O

Here is the balanced equation. Below is a worked example of stoichiometry problem. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html