Homework Help: vapor pressure

Posted by yayhawknelson on Thursday, January 18, 2007 at 12:52am.

The total pressure in a flask containing air and ethanol at 25.7C is 878 mm Hg. The pressure of the air in the flask at 25.7C is 762 mm Hg. If the flask is immersed in a water bath at 450C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature is ? mm Hg.
Hint: you will need to correct the pressure of air at the new temperature using the Gas Law: P1/T1 = P2/T2

note: am i right in thinking that the original vapor pressure is 120? please help me from there :)

Are you sure the 980 numbeer isn't 1980?Your numbers don't make sense. Heating the air that much would have to raise the total pressure more.

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