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December 23, 2014

Homework Help: Advance Chemistry

Posted by A51AN on Thursday, March 6, 2008 at 8:37am.

A series of measurements are made in order to determine the molar mass of an unknown gas. First, a large flask is evacuated and found to weigh 134.567 g. It is then filled with the gas to a pressure of 735 torr at 31C and reweighed; its mass is now 137.456 g. Finally, the flask is filled with water at 31C and found to weigh 1067.9g. The density of water at this temperature is 0.997 g/mL. Assuming that the ideal-gas equation applies, what is the molar mass of the unknown gas?

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