Choice of pressure when using ideal gas equation

by jasoncurious
Tags: ideal gas
jasoncurious is offline
Dec23-12, 03:41 AM
P: 8
100g of CO are contained in a weighted piston-cylinder device. Initially, the CO is at 1000kPa and 200C. It is then heated until 500C. Determine the final volume of the CO treating it as an ideal gas.

This is what my lecturer gave in his solution:


My question is: why is the original pressure (1000kPa) been used instead of the final pressure?

Thanks for your help.
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DrDu is online now
Dec23-12, 05:45 AM
Sci Advisor
P: 3,367
Because initial and final pressure are equal as long as the weight on the cylinder remains the same.
Studiot is offline
Dec23-12, 10:37 AM
P: 5,462
You can also use Charles Law to calculate the final volume, having calculated the initial volume from the universal gas law.

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