The energy required for the whole process has to be calculated
as follows:
H2O(s)Â Â ------->Â Â Â Â
H2O(s)Â Â -------->Â Â Â Â Â
H2O(l)Â Â Â ------> H2O(l)Â Â
----------> H2O(g)
-19.4Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
OÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
OÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
100 all in oC
        Â
2.09J/g                       Â
deltaH
fus             Â
4.18J/g                Â
deltaH
vap          Â
energy required
Energy for step I = 2.09 x 90.1 = 188.309J
energy for step II = 6.02x1000 x 5 =30100J
energy for step III = 4.18 x 90.1 =376.618J
energy for step Iv = 40.7 x 1000 x 5 = 203500J
Thus the totyal energy required for all the processes =
234164.927 J =234.16 kJ
