Friday, May 21, 2010

What is the new temperature of the gas in C?

A gas at 59.0 degrees C and atmospheric pressure fills a cylinder. The gas is transferred to a new cylinder with three times the volume, after which the pressure is half the original pressure.

What is the new temperature of the gas in C?
P1V1 / T1 = P2V2 / T2





T2 = (P2)(V2)(T1) / (P1)(V1)





T2 = (1/2P1)(3V)(T1) / (P1)(V1)





T2 = (1/2)(3)(T1)





T2 = 1.5(T1)





Convert 59C to K.





59C + 273.15 = 332.15K





T2 = 1.5(332.15K)





T2 = 498.225K





Convert back to C





K - 273.15 = C








T2 = 225.075C
Reply:It should be the same as before the transfer, correct?
Reply:________________________________________...





Initial pressure =p1=P





initial volume=v1=V





initial temperature=T1=273+59=332 K





final pressure =p2 =P/2





final volume=v2=3V





final temperature=T2= ?





Applying equation of state,p1v1/T1 =p2v2/T2





T2=p2v2T1/p1v1





T2=P*3V332/2PV





T2= 498 K





t =498 -273= 225 C





The new temperature of the gas is 225 C


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