At 0,00℃, for H2O (l) the saturation pressure P = 4,581 dry (i.e., the water vapor equilibrium pressure)
and the vaporization heat, ?vapHm = 45,067 kJ mol-1. The steam can be regarded as an ideal gas.

a) Calculate water pressure at 100,00?C with the assumption that ?vapHm is a constant between
0,00 and 100,00℃.

b) Between 0,00 and 100,00℃, ?Cp,m for water evaporation can be adapted to the expression
?Cp,m = (-51,22 + 0,03153T) J K-1 mol-1.

Derive an expression between 0,00 and 100,00?C for ?vapHm as a function of T as well as
calculate P at 100?C.

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