A Carbon dioxide fire extinguisher initially contains 5.5lbm of CO2 gas. In “real life” the CO2 would not be all gas, but for this problem assume that it is. The CO2 gas has an initial pressure of 860psia and initial temperature of +72oF. Immediately after putting out a fire, it has a final pressure of 100psia and a final temperature of -30oF. Assume ideal gas law behavior.
a) Show that the specific gas constant for CO2 gas is approximately R=1131ft∙lbf/(slug∙R).
b) What is the initial density of the CO2 gas in the fire extinguisher?
c) What is the initial mass of CO2 gas in slug?
d) What is the initial internal volume of the fire extinguisher?
e) Assume that the internal volume does not change. What is the final mass-density of CO2 gas inside the fire extinguisher (at 100psia, -30oF)?
f) What is the final mass of CO2 gas inside the fire extinguisher? Give answer in both slug and in lbm.
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