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kinetic theory of gases

When 21.9 J was added as heat to a particular ideal gas, the volume of the gas changed from 55.5 cm3 to 84.2 cm3 while the pressure remained constant at 1.01 atm. (a) By how much did the internal energy of the gas change? If the quantity of gas present is 1.05 x 10-3 mol, find the molar specific heat of the gas at (b) constant pressure and (c) constant volume. 

all above with units pls

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