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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: stag on March 17, 2011, 11:00:38 PM

Title: Help Calculating the number of moles of water vapor
Post by: stag on March 17, 2011, 11:00:38 PM

use the ideal gas constant to calculate the number of moles of water vapor.
p=18.65 torr
v=39.5 L
r=0.08206
t=294 K

this is the equation im supposed to use right?
n= PV/RT


This is what i got.
n=(18.65)(39.5)/(0.08206)(294)=30.5 mol H20

but when i look it up online the answer is 0.04 moles of gas. am i right? if not what am i doing wrong?

Title: Re: Help Calculating the number of moles of water vapor
Post by: opti384 on March 18, 2011, 12:02:06 AM

You should convert 18.65 torr into atm.

Title: Re: Help Calculating the number of moles of water vapor
Post by: Borek on March 18, 2011, 05:14:07 AM

Please stop reposting the same problems, you have already opened the thread with the same question.

Topic locked.