A 1.17 g sample of an alkane hydrocarbon gas occupies a volume of 674 mL at 28°C and 741 mmHg. Alkanes are known to have the general formula CnH2n+2. What is the molecular formula of the gas in this sample? (R = 0.08206 L⋅atm/K⋅mol)
◦ CH4
◦ C2H6
◦ C3H8
◦ C4H10
◦ C5H12