Homework Help: CHEMISTRY

Posted by Matt on Sunday, January 20, 2008 at 6:06pm.

A glass vessel has a mass of 53.8718 g when evacuated (no air). When filled with a liquid of density 1.319 g mL-1 it has a mass of 255.7390 g and when filled with an unknown gas at 752.3 torr and 16.12°C it has a mass of 54.2483 g. What is the molar mass of the gas, express your answer in scientific notation.?

...i'm confused about the three masses given. from the equation P=d(RT/MM), you dont need mass at all. please help?

CHEMISTRY - DrBob222, Sunday, January 20, 2008 at 6:09pm
You don't have the density, do you? The density given is that of a liquid.
CHEMISTRY - Matt, Sunday, January 20, 2008 at 6:21pm
how is liquid or the inital mass relevant to the question, if we're only concerned with the gas?
- CHEMISTRY - DrBob222, Sunday, January 20, 2008 at 6:26pm
  The liquid and mass and density of the liquid gives you a way of determining the volume of the container. Then the volume of the container and the mass of the gas gives you the density of the gas and from that the molar mass of the gas.

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