The combustion of octane, C8H18, in the presence of oxygen gas (O2) produces CO2 and H2O in the following balanced equation:
2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O
If (6.1x10^1) g of C8H18 is added to (1.540x10^2) g of oxygen gas, how many grams of excess reactant is left over once the reaction has been completed?
