When O2 reacts with C2H6, according to the equation: 2 C2H6 + 7 O2 = 4 CO2 + 6 H2O, how much CO2 is produced from 60.0 g of C2H6?

Answer 1

Here is a worked example of a stoichiometry problem.
http://www.jiskha.com/science/chemistry/stoichiometry.html

Answer 2

144