- #1

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ok, here is my struggle. I have two states, state 1 and 2, which i will call just 1 and 2.

1:

T=298kelvin

V=0.025m(cubed)

P=310Kpa

Mass1=Mass2

R=0.2870

2:

T=323kelvin

V=0.025m(cubed)

P=??

Mass2 = Mass1

R=0.2870

This is how i solved for P2 and it was WRONG!!!!!

P2V2=mR2T2 where m is mass

mass=V(rho) = 0.025(1.22) = 0.0305kg of air in the closed system

P2= mRT divided by volume. I get 113kpa. Book says 336kpa.

IF I USE P1V1/T1=P2V2/T2, i get the right answer. BUT it should have worked the way i did solving for mass because mass IS volume multiplied by density and it doesnt change..

Thanks