Acompound has a molecular weight of 50 kg/kmol a normal melting point of 300 k a normal boiling point of 350 k a constant heat capacity in the solid phase of cp 3000 j/kg k a constant heat capacity in the liquid phase of cp 3600 j/kg k a constant density in the solid phase ofp 640 kg/m' a constant density in the liquid phase of p - 480 kg/m3 . an ideal gas heat capacity of cp* 4186.8-62874 13.56x10%r j/kg. k, with t representing the temperature in kelvin an enthalpy of fusion - 175 kj/kg at atmospheric pressure an enthalpy of vaporization 300 kj/kg at atmospheric pressure ° vapor phase can be approximated by the ideal gas law a. what is the change in internal energy when this compound boils at atmospheric pressure? b. the compound is initially at 278 k. if the pressure is constant at p 101.325 kpa throughout the process, and the specific enthalpy of the compound is increased by 815 kj/kg, what is the final temperature?