Posted by **amie** on Wednesday, June 4, 2008 at 12:06am.

a gas volume has of v1=450ml. if the temp is held constant, what volume would gas occupy if the pressure p2=2p1?

omg i cant figure anything out!!!!!!!!

- chem -
**DrBob222**, Wednesday, June 4, 2008 at 12:23am
P1V1 = P2V2.

Just make up a number for P1. Call it anything, say 10 atm.

Then P1 = 10 atm

V1 = 450 mL

P2 = 2*P1 = 2*10 = 20 atm.

V2 = ??

It makes it a much simpler problem if you do that. You CAN (but I think it makes it harder) just use

P1 = P1

V1 = 450 mL

P2 = 2*P1

V2 = ??

Then P1*450 = 2*P1*V2

Solving for V2 gives

V2 = P1*450/(2*P1) = 450/2 = 225 mL. You see the P1 cancels which is WHY we can use any number we choose and it doesn't matter which number we choose.

Doing it the other way gives us

10*450=20*V2

V2 = 10*450/20

V2 = 4500/20 = 225 mL.

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