Posted by Janus on Monday, March 1, 2010 at 8:01am.
A 12 cu.ft tank contains hydrogen sulfide gas at 150psia & 80°F after 5 pounds of the gas have been drawn out. Before any gas left the tank the temperature was 70°F.
What mass of gas was in the tank originally and what pressure?
just to check:
R=45.2
V=12cu.ft = 20736cu.in
t=80°f = 540°R
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

Thermodynamics  drwls, Monday, March 1, 2010 at 9:45am
Your method looks OK but I would have to check the value of R in such unconventional units. I don't understand whay you multiplied V by 1/12 instead of 12

Thermodynamics  Janus, Monday, March 1, 2010 at 10:17am
My mistake I forgot to add the units
Unit of R = (ft lb(force)) / lb(mass) °R
P = lb x (ft lb(force)) / lb(mass) °R) / (cu in x (1ft/12in)
the (1ft/12in) is suppose to make the P into lb / sq in.

Thermodynamics  Janus, Monday, March 1, 2010 at 10:21am
Edit:
P = lb x (ft lb(force)) / lb(mass) °R) °R / (cu in x (1ft/12in)

Thermodynamics  drwls, Monday, March 1, 2010 at 11:57am
If you were converting cubic inches to cubic feet, you would multiply by 1/1728, not 1/12.
Answer This Question
Related Questions
 science  'Imagine there is a tank of unknown gas that contains 53.31% carbon, ...
 physics  a metal tank with a volume of 3.10 L will burst if the absolute ...
 algerbra  how to set up this problem? your new car's gas tank holds 12 gallons ...
 physics  A rigid tank contains 1.80 moles of an ideal gas. Determine the number...
 Physics  A rigid tank contains 1.80 moles of an ideal gas. Determine the number...
 Physics  A rigid tank contains 1.20 moles of an ideal gas. Determine the number...
 Chemistry  Propane gas is stored in a tank at a pressure of 15.0 atm at 22.0 °C...
 Physics  A metal tank with volume 3.10 L will burst if the pressure of the gas ...
 physics  Question Part Points Submissions Used 1 –/1 0/2 Total –/1 A rigid tank...
 algebra  while driving a car you realize that you only have one eighth gas ...
More Related Questions