Solve it by ideal gas law I have an old propane tank that I want to use for stor

Question

Solve it by ideal gas law I have an old propane tank that I want to use for storing compressed air. but I don't want to put in too high a pressure and burst the tank To find a safe pressure for it to hold. I thought this way: I know when it held propane. I could fill it with 20 Ib of propane safely. Given the volume of the lank is 4.7 gallons (stamped on the side), what pressure can the tank hold safely in service? (I'm thinking you use the idea gas law. and make a reasonable assumption about a reasonable high outdoor temperature when the propane tank was lilted. You have tables m the book, as well as online, to look up any constants needed for propane.)

Explanation / Answer

moles of propane in 20lb= 20/44=0.4545 , volume = 4.7 gallons= 4.7*0.1336ft3=.62792 ft3

t= temperature assumed = 40 deg.c = 40*1.8+32= 104 deg.F= 104+460= 564 R, R= 0.7302 ft3.atm/mole.R

P= nRT/V= 0.4545*0.7302*564/0.62792=298 atm

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