The Dumas method is used to determine the molecular weight of a volatile liquid (M = mRT/PV;
R = 0.0821 L atm mol-1 K-1. The liquid weighs 0.68 g at 1.00 atm and 25°C. It occupies 277 mL. The liquid is
a. acetone (molecular weight = 58.1 g/mol)
b. ethanol (molecular weight = 46.1 g/mol)
c. ethyl acetate (molecular weight = 88.1 g/mol)
d. isopropyl alcohol (molecular weight = 60.1 g/mol)