Posted by Elizabeth on Thursday, February 9, 2012 at 7:46pm.
A compressed gas cylinder contains 1.00 103 g of argon gas. The pressure inside the cylinder is 2096 psi (pounds per square inch) at a temperature of 19°C. How much gas remains in the cylinder if the pressure is decreased to 656 psi at a temperature of 27°C?

Chemistry  DrBob222, Thursday, February 9, 2012 at 10:48pm
Convert 2097 psi to atm.
2097 psi/14.7 = ? atm
Convert 1000 g to mol Ar. mol = grams/molar mass.
Use PV = nRT, substitute and solve for V = volume.
Then reuse PV = nRT, substitute the new P, the old V, R, and new T and solve for n. Then n = grams/molar mass, you know n and molar mass, solve for grams.
Don't forget T must be in kelvin.
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