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Determine the value of work (w) when a piston of volume 0.2 litres expands against an external pressure of 200 kPa to a volume of 3.4 Litres?

a total pressure of a gas mixture is observed 770 atm and this mixture contains each of the given gases N2,O2,CO2 at the indicated partial pressures: , 118 atm; , 206 atm; and , 196 atm. It also has helium gas. What mass of helium gas is present in a 14.5 sample of this mixture at 265 atm pressure?

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