Given the Following Data, Calculate How Many Moles of Gas

Multiple Choice

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