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September 2, 2015

Homework Help: Thermodynamics

Posted by Janus on Monday, March 1, 2010 at 8:01am.

A 12 cu.ft tank contains hydrogen sulfide gas at 150psia & 80F after 5 pounds of the gas have been drawn out. Before any gas left the tank the temperature was 70F.

What mass of gas was in the tank originally and what pressure?

just to check:
R=45.2
V=12cu.ft = 20736cu.in
t=80f = 540R

m=(PV)/(RT)
m=(150 x 20736 x (1/12)) / (45.5 x 540)
m=10.6195

original mass inside the tank
10.6195+5=15.6195lb

original pressure
P=(mRT)/V
P=(15.6195 x 45.2 x 530) / (20736 x (1/12))
P= 216.5398

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