Given the Following Data, Calculate How Many Moles of Gas

Given the following data, calculate how many moles of gas are produced in the combustion of one mole of butane, C₄H₁₀.
Standard heats of formation (kJ/mole) :
H₂O(g) : -241.82
CO₂(g) : -393.5
Butane: -147.6
Formula weight of butane: 58.12 g/mole
L/mole of a gas at STP: 22.4L

A) 2
B) 5
C) 8
D) 9
E) none of the above