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Posted by **Don** on Tuesday, November 30, 2010 at 5:20am.

How do I start this? Do I somehow use the ideal gas law?

- Chem -
**Dr Russ**, Tuesday, November 30, 2010 at 6:40amUse PV=nRT

so R=P1V1/n1T1

and R=P1V1/n2T2

R=P1V1/n1T1=P1V1/n2T2

n1T=n2T2

- Chem -
**Don**, Tuesday, November 30, 2010 at 6:56amI got the answer to be 400. But can you explain to me those formulas? I'm still a bit confuse on how you got them. Where do these P1 and P2 and T1 and T2 come from

- Chem -
**Dr Russ**, Tuesday, November 30, 2010 at 9:07amThe original formula is

PV=nRT

for the question given we have a set of starting conditions

P=P1

V=V1

n=n1

T=T1

hence

P1 x V1=n1 x R x T1

which rearranges to

R=P1V1/n1T1

the second set of conditions is

P=P1

V=V1

(because P1 and V1 are constant in the question)

T=T2

N=n2

so

R=P1V1/n2T2

as R is the same in both cases

R=P1V1/n1T1=P1V1/n2T2

which rearranges to

n1T=n2T2

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