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An insulated cylinder of 0.4m diameter and 0.8 m length contains 1 kg of oxygen. Paddle work is done on the gas to increase its pressure from 3.0 kgf /cm2 to 60 kgf / cm2. Determine the change in

         (i)   internal energy,

         (ii)  work done on the gas and the change        in its enthalpy. 

         Assume that Cp = 0.218 kcal/ kg°C and                                    Cv = 0.154 kcal / kg°C.

If the cylinder is now emptied to the atmospheric pressure through a valve, the flow velocity being negligible, determine the temperature and mass of oxygen left in the cylinder.

 

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