Chemistry Question? Help please!!!!!!!

Posted on 2014-11-19 05:16:00 in Chemistry by REEVES

Using the procedure outlined in the book, a student collects 54.5 mL of an unknown hydrocarbon gas over water at 21.0 oC and 760.5 torr. The student found that the partial pressure of the unknown is 0.9761 atm. If the initial mass of the lighter is 137.0517g and the final mass of the lighter is 136.9542 g, what is the molar mass (g/mol) of the gas collected?

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