Help with Gases experminet!!!

[delco714]

The question isssss...:

 

A mixture of gases collected over water at 14ºC has a total pressure of 0.981 atm and occupies 55 mL. How many grams of water escaped into the vapor state?

 

 

now at 14 C, water has a pressure of 12 torr, or 0.01279 atm.

 

I did the ideal gas law equation for no (moles), using 0.981 atm, which came to be 0.0023 mole, if we X that by water's weight (18.01528 g/mole), it is 0.0413g. But this isn't right.. where is my mistake?. i Know that the pressure of water ^^^ has to be used somewhere, but I don't know how/where...

 

dont worry about it, i got it. thanks anyway, i guess it was too hard for you to figure out.

[John Cuthber]

Why do you think they tell you the vapour pressure of water?

[Phi for All]

thanks anyway, i guess it was too hard for you to figure out.

Too much studying makes you cranky, doesn't it?

[delco714]

you bet your ass it does Phi.. try like.. 58 hours of studying in 4 days... 3 tests.. in last 5 days i accumulated on average 4.5hr sleep a night.. but i got a 93 on a chem test where avg was 58.. a 96 on bio, avg 75... and a psych course (don't even ask.. prof is a PSYCHO bit<h)... otherwise.. yes.. hopefully i don't burn out.. thennnn over the winter break.. I'm going into Manhattan to take a phlebotomy (blood taking, and lab analysis regarding blood) course for 3 nights week, 3 weeks. Than another semester... a year from now I will have organic chem, physics.. two advanced psych courses and calc I. (i'm pre-med and a psych major..).. and after THAT semester, i have the same schedule, minus the calc, and add MCAT prep course... it's a long road ahead my friends..

[Phi for All]

it's a long road ahead my friends..

It sounds like it. Too long a road to start snapping now. The "i guess it was too hard for you to figure out" comment seemed a bit out of character for you.

 

But not for a sleep-deprived, high-octane, pre-med test junkie. Grats on the scores, it's a shame we didn't have a chem guru lurking at the same time you posted, but that happens on a discussion forum. Very little instant gratification.

 

You deserve a night out, or maybe a night's sleep.