Register to reply 
Choice of pressure when using ideal gas equationby jasoncurious
Tags: ideal gas 
Share this thread: 
#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: 3,628

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.



Register to reply 
Related Discussions  
Pressure of an ideal gas  Atomic, Solid State, Comp. Physics  8  
Pressure CookerInvolving Ideal Gas law and Total Pressure  Advanced Physics Homework  1  
Voltage Vs Pressure: Ideal Gases not so ideal?  General Physics  0  
Liquid pressure multiple choice  Introductory Physics Homework  2  
Pressure and Ideal Gas Law  Introductory Physics Homework  10 