JEE Chemistry Online Test States Of Matter Set F

An evacuated glass vessel weights 50 g when empty, 144.0 g when filled with a liquid of density 0.47 g ml^–1 and 50.5 g when filled with an ideal gas at 760 mm Hg at 300 K. The molar mass of the ideal gas is

(Given R = 0.0821 L atm K^–1 mol^–1)