Question

Two identical gas cylinders each contain 20.0 kg of compresses air at 1.00 x 106 pa and 275 K. One of the cylinders if fitted with a safety valve that releases air into the atmosphere if and only if the pressure in the cylinders raises above 1.10 x106 pa (the other cylinder does not have a pressure release valve). The temperature of the cylinders is then raised to 310 K. Determine: (a) The pressure in the cylinder without the pressure release valve.

(b) The mass of gas that escapes from the cylinder with the pressure release valve.

Answer 1

FIGURE THE MOLES OF GAS ORIGINALLY.
N=pv/rt p,v,t GIVEN
AFTER THE NEW TEMP, FIGURE THE MOLES remaining
n'=Pv/T'

so mass of gas escaped = 27(n-n')

a) is done on the other post.