5. Making reasonable approximations, estimate the vapor pressure of solid nickle at 1000 C. indicate the assumptions made in the calculation. Use the following equilibrium states obtained from the phase diagram of nickle to do the calculations. The normal meiting point is 1452 \"C. The vapor pressure of liquid nickle is 0.100 torr at 1606 l"C and 1.00 torr at 1805 C. The molar enthalpy of fusion is 4.25 kcal/mol. (25%)