Argon gas has several industrial uses, including are welding and steel making. A

Question

Argon gas has several industrial uses, including are welding and steel making. Argon is nonflammable and nontoxic, and so can be kept at room temperature (T= 19.5 degree). Companies can buy Argon gas in cylinders which are kept at pressure of P = 217 psi. In this problem you may assume that ideal gas law still holds. (a) How much average kinetic energy (in J) does each atom of the Argon gas in the cylinder have? (b) If the volume of this cylinder is V = 174 L. how many moles of Argon are inside?

Explanation / Answer

KEavg = 3/2 *k*T

k = boltzman constant

T = 19.5 oC = 292.5 K

KEavg = 6.05 x 10^-21 J

part b )

PV = nRT

P = 217 psi

1 psi = 0.068046 atm

217 psi = 14.766 atm

n = PV/RT

R = 8.2 x 10^-2 L atm K^-1 mol^-1

T = 19.5 oC = 292.5 K

V = 174 L

n = 107.12 moles

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