A compressed gas cylinder contains 1.00 103 g of argon gas. The pressure inside the cylinder is 2035 psi (pounds per square inch) at a temperature of 15°C. How much gas remains in the cylinder if the pressure is decreased to 610. psi at a temperature of 30.°C?
Thanks for the help in advance :)
chemistry - DrBob222, Wednesday, April 14, 2010 at 5:46pm
Do you mean that you open the valve on the cylinder and release Ar gas until the pressure is decreased to 610 psi at 30 C?
chemistry - kristen, Wednesday, April 14, 2010 at 5:48pm
ohh yes i think so
chemistry - DrBob222, Wednesday, April 14, 2010 at 5:51pm
I would go to google, type in "2035 psi to atmospheres" without the quotation marks. Do the same for 610 psi. Then use PV = nRT to calculate n remaining in the vessel and convert that to grams. Subtract from the initial amount to obtain the grams Ar remaining.
chemistry - kristen, Wednesday, April 14, 2010 at 6:03pm
i found both atmospheres
so it would be 1.00103(2035)=?
chemistry - DrBob222, Wednesday, April 14, 2010 at 6:18pm
I don't think so. You haven't used PV = nRT
I would substitute P, V, R, and T (don't forget to change T t Kelvin) from the final conditions and calculate n, number of moles. Then moles = grams/molar mass and determine grams, then subtract from the initial grams to find that remaining.