# Kinetic Energy Problem

1. Jan 6, 2010

### dnl65078

Please Help! Kinetic Energy Problem

1. The initial pressure in an ideal gas is 1.40 atm when its temperature is 299 K. The temperature is increased to 315 K and the volume is increased to 1.29 times its initial value. Calculate the final pressure.

2. R = 8.31 J/molK

PLEASE HELP!

THANKS IN ADVANCE!!

2. Jan 6, 2010

### ideasrule

Re: Please Help! Kinetic Energy Problem

What have you tried already?

3. Jan 6, 2010

### dnl65078

Re: Please Help! Kinetic Energy Problem

Thats just the thing. I cannot figure out what formula to use. The formula's I have are PV=nRT and PV=NKbT... none of the formulas I was given seem to be valid for a "change in temp/volume"

4. Jan 6, 2010

### ideasrule

Re: Please Help! Kinetic Energy Problem

Try writing out PV=nRT for both the "before" and "after" situations. You'll be able to solve for the final pressure from there, even though you don't know n (and don't need to know R).

5. Jan 7, 2010

### VesperJazz

Re: Please Help! Kinetic Energy Problem

Make 2 equations and solve by dividing the equations. Cancel out the same unknown.

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