What is the change of entropy of water Lf 0333 MJkg Lv 226

What is the change of entropy of water (Lf = 0.333 MJ/kg, Lv = 2.26 MJ/kg) when 450. grams of water:

(a) changes from liquid to steam?

(b) changes from ice to liquid?

Solution

change of entropy of water = heat/temparature

a) dS = 0.450*2.26*10^6)/(273+100) = 2726.54 J/K

b) dS = 0.450*0.3333*10^6)/(273) = 549.39 J/K