First let us compute for the number of moles of butane (molar mass = 58.12 g/mol)
number of moles = 145 g / (58.12 g/mol) = 2.49 mol
We use the ideal gas equation to calculate the volume:
V = n R T / P
V = 2.49 mol * 62.36367 L torr / mol K * 308.15 K / 745 torr
V = 64.35 L
