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# a 10 cubic ft tank contains gas at a pressureof 500 psia temperature of 85 degree fahrenheit and a weight of 25 pounds .

a 10 cubic ft tank contains gas at a pressureof 500 psia temperature of 85 degree fahrenheit and a weight of 25 pounds . a part of the gas was discharge and the temperature and pressure changed to 70 degree fahrenheit and 300 psia respectively. heat was applied and the temperature was back to 85 degree ffahrenheit . find the final wight, volume and pressure of the gas