Isobaric Expansion for Ideal Gas

[Windseaker]

Given: working fluid is an Ideal gas

P=30 psi
V=2ft3
T=20degreeC

Q. what is initial state of the gas when?

Isobaric expansion to 3ft3

 

[Gear300]

Isn't what they gave you the initial state of the gas?

 

[Windseaker]

ok finial state--sorry

 

[Gear300]

Since the expansion is isobaric, the pressure stayed the same. They also specified the final volume, so all you need is the final Temperature. You already know the initial states for P_iV_i = nRT_i (except for the moles); the final temperature in P_fV_f = nRT_f can be found by setting the moles of the initial state and the moles of the final state equal to each other.

 

[Windseaker]

I through is was

PiVi/Ti = P2V2/T2 ?

 

[Gear300]

I through is was

PiVi/Ti = P2V2/T2 ?

P1V1 = nRT1
P2V2 = nRT2

nR = P1V1/T1 = P2V2/T2