Homework Help: Chemistry

Posted by CHEMHELP..BOB on Sunday, April 24, 2011 at 8:44pm.

The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of
the air in the flask at 257C 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.

I really dont know what to do..i drew a picture but theres just so much info i cant seem to focus on what i need to find.

Chemistry - bobpursley, Sunday, April 24, 2011 at 8:51pm
Hmmmm. A water bath at 450C???????

Neglecting that crazy temperature's effect on water,

the pressure of of the ethanol goes up proportionally as does the air.

The total pressure increased 980/878. Each partial pressure increased by the same factor.

new ethanol pressure= 980/878 * (878-257)
Chemistry - CHEMHELP..BOB, Sunday, April 24, 2011 at 9:05pm
***** 25.7, 25.7, 45.0
sryy

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