Determine the internal energy change Du of hydrogen, in kJ/kg, as it is heated from 200 to

Question:

Determine the internal energy change Du of hydrogen, in kJ/kg, as it is heated from 200 to 800 K, using
(a) The empirical specific heat equation as a function of temperature (Table A - 2c),
(b) The cv value at the average temperature (Table A - 2b), and
(c) The cv value at room temperature (Table A - 2a).