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3.5 A glass vessel weighs 40.1305 g when clean, dry, and evacuated; it weighs 138.2410 g when filled with water at 25.0 C (density of

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3.5 A glass vessel weighs 40.1305 g when clean, dry, and evacuated; it weighs 138.2410 g when filled with water at 25.0 C (density of water = 0.9970 g/ml.). When it is filled with an unknown gas at 772 mmHg and 22.4 C. The gas-filled vessel weighs 40.4868 g. What is the molar mass of the gas? (7 points)

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