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.

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

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

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

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..

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.