The complete combustion of octane, C8H18, the main component of gasoline, proceeds as follows: 2C8H18 (l) + 25 O2(g) -- 16 CO2(g) + 18 H2O (g)
a.) How many moles of 02 are needed to burn 1.50 mol of C8H18?
B.) How many grams of 02 are needed to burn 10.0 g of C8H18?
C.) Octane has a density of 0.692 g/ml at 20 degrees Celsius. How many grams of 02 are required to burn 15.0 gal of C8H18 (the capacity of an average file tank)?

Question

The complete combustion of octane, C8H18, the main component of gasoline, proceeds as follows: 2C8H18 (l) + 25 O2(g) --> 16 CO2(g) + 18 H2O (g) 
a.) How many moles of 02 are needed to burn 1.50 mol of C8H18?
B.) How many grams of 02 are needed to burn 10.0 g of C8H18?
C.) Octane has a density of 0.692 g/ml at 20 degrees Celsius. How many grams of 02 are required to burn 15.0 gal of C8H18 (the capacity of an average file tank)?