Balance the following chemical equation for the combustion

Octane undergoes complete combustion to form carbon dioxide and water. a) Balance the following chemical equation for the combustion of octane: C8H18(l) O2(g) —–> CO2(g) H2O(l) b) How many moles of oxygen are required to burn 1.00 mole of octane? c) How many grams of octane are needed to produce 6.63 moles of water?