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Physics 22 Online
OpenStudy (anonymous):

HOW MANY LITERS OF WATER CAN BE MADE FROM 34g of oxygen gas at STP?

OpenStudy (anonymous):

you would need some kind of hydrogen to get water right lol, how much hydrogen do you have?

OpenStudy (anonymous):

it says that the density of the water=1.00 g/ml

OpenStudy (anonymous):

Well assuming you have an excess amount of Hydrogen I would use pv=nrt equation, have you learned about this?

OpenStudy (anonymous):

yes this is our first 2 day but i'm not understanding it still

OpenStudy (anonymous):

ok, well you would want to solve that equation for the volume, which is v using basic algebra. So p=pressure t=temp in kelvin r=gasconstant which is .08206(L-atm/mol-k) and n=number of moles you have

OpenStudy (anonymous):

so take 55g of oxygen convert it into moles, pressure and temp are give due to the fact that you're at STP. STP= 1atm and 0 C, 0C is 273 Kelvin

OpenStudy (anonymous):

try to work this out, all the units should cancel leaving you with liters, the density wasn't needed.

OpenStudy (anonymous):

i got 3.43 moles when i converted

OpenStudy (anonymous):

what about pressure and volume

OpenStudy (anonymous):

volume is what you want to solve v=NRT/P and pressure=1atm at STP

OpenStudy (anonymous):

and to get the number of moles of water, you have to write out the balance chemical reaction for H+02= h20 that is not balanced, let me know if you need help balancing it.

OpenStudy (anonymous):

2H+02+H202 , The H's and O's are not equal

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