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Choice of pressure when using ideal gas equationby jasoncurious
Tags: ideal gas 
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#1
Dec2312, 03:41 AM

P: 8

100g of CO are contained in a weighted pistoncylinder device. Initially, the CO is at 1000kPa and 200°C. It is then heated until 500°C. Determine the final volume of the CO treating it as an ideal gas.
This is what my lecturer gave in his solution: V2=(mRT2)/P=(0.1kg*0.2968kPa.m3/kg.K*(500+273)K)/1000kPA My question is: why is the original pressure (1000kPa) been used instead of the final pressure? Thanks for your help. 


#2
Dec2312, 05:45 AM

Sci Advisor
P: 3,593

Because initial and final pressure are equal as long as the weight on the cylinder remains the same.



#3
Dec2312, 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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