16. The heat capacity (CP) for an element Z is CP=24+5103T(J/ mole K), to what temperature would you have to heat Z at constant pressure to raise its molar enthalpy by 1J? (Start with Z in the state: P=1atm,T=298K ) (a) 286.4K (b) 298.04K (c) 541.32K (d) 785.44K (e) >1000K 17. 2Ni(S)+O2=2NiO,G0=471200+172TJ 2NiO=2Ni(L)+O2,G0=506180192.2TJ The molar entropy of melting nickel is J/K. (a) 0 (b) 10.1 (c) 23.5 (d) 37.1 (e) 47.5 18. In the phase diagram of one component system, pressure is plotted as a function of temperature. During the transition from liquid state to vapor state, which of the following is true? (a) (dP/dT) is positive (b) it is endothermic reaction (c) the volume change from solid to vapor is increasing (d) all of above are correct 19. The relationship between the variations of pressure and temperature which is require for the maintenance of equilibrium between two different phases may be expressed by the (a) van der Waals equation (b) Ellingham line (c) Gibbs-Duhem equation (d) Clapeyron equation