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December 28, 2014

Homework Help: Chemistry(Please help)

Posted by Hannah on Sunday, February 19, 2012 at 10:48pm.

The vapor pressure of diethyl ether is 463.57 mm Hg at 25 degrees celsius. How many grams of aspirin C9H8O4, a non volatile nonelectrolyte (mw=180.1g/mol), must be added to 216.7g of ether to reduce the vapor pressure to 453.74 mm Hg.

Ether=74.12g/mol


so I did 463.57 - 453.74 = 7.600

Then I found moles of ether to be 4.0313.

I do not understand the next step to find Xether.

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