How to calculate entropy of the following?

find the change in entropy of steam generated at 400 'c from 5kg of water at27 'c and atmospheric pressure. take specific heat of water to be 4.2 KJ/Kg.k, heat of vaporization at 100 'c as 2260 KJ/Kg and specific heat for steam given by; Cp=R(3.5+1.2T+0.14T^2),J/Kg.K...