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An evacuated glass vessel weighs 50.0 g when empty. 148.0 g when filled with a liquid of density 0.98 g mL^-1 and 50.5 g

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An evacuated glass vessel weighs 50.0 g when empty. 148.0 g when filled with a liquid of density 0.98 g mL-1 and 50.5 g when filled with an ideal gas at 760 mm Hg at 300 K. Determine the molar mass of the gas.

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Weight of liquid = 148 - 50 = 98 g

Hence, molecular weight of gas (m) = 123

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