You have 15.0 L of nitrogen gas at 100°C and 200 kPa. What volume of gas will you have at STP

Help with chemistry please. I've never really gotten how to do this, so don't be afraid to show your work :)

my recommendation to all students studying these 2 state gas law problems is this..

(1) start with P1V1/(n1T1) = P2V2/(n2T2)
(2) rearrange for your desired unknown
(3) canceling anything held constant
(4) solve... plug and chug... and remember T must be on an absolute temperature scale (R or K... never °C nor °F)

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starting with
P1V1/(n1T1) = P2V2/(n2T2)

rearranging.
V2 = V1 x (P1/P2) x (T2/T1) x (n2/n1)

assuming n is constant.. n2 = n1.. and we can cancel that
V2 = V1 x (P1/P2) x (T2/T1)

solving..
V2 = 15.0L x (200kPa / 101.325 kPa) x (273.15K / 373.15K)
V2 = 21.7L

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notice how I grouped like terms? that will help you keep P1, T2, n2 in the numerator of the fractions
notice how this 1 equation can replace all those charles laws, boyles law, combined gas law etc?

why is that? because they are all special cases of P1V1/(n1T1) = P2V2/(n2T2) with different things held constant. And by canceling whatever is constant, we naturally derive those equations.

Where does P1V1/(n1T1) = P2V2/(n2T2) come from? the ideal gas law. same as the rest of those specialized gas laws.
PV = nRT
PV/(nT) = R = a universal constant
so any PV/(nT) = any other PV/(nT)
and..
'P1V1/(n1T1) = P2V2/(n2T2) = P3V3/(n3T3) = P4V4/(n4T4) etc..

your choice.. memorize all 15 variations of P1V1/(n1T1) = P2V2/(n2T2) and when they apply and hope to God you get the right equation come test time
OR
memorize P1V1/(n1T1) = P2V2/(n2T2) (or at least where it came from) and learn how to use it.

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questions?

http://chemistry.about.com/od/homeworkhe…

http://www.shodor.org/unchem/math/units/…

http://www.chemistrysurvival.com/pdf/Che…

http://www.arbuiso.com/handouts/54gaspro…