2. From 298K up to its melting temperature of 1048K, the constant pressure molar heat capacity of RbF is given as cp=7.97+9.2103T+1.21105T2calories/degree and from the melting temperature to 1200K, the constant-pressure molar heat capacity of liquid RbF is given as cp=11.30+0.833103T+350.7105T2calories/degree At its melting temperature the molar heat of fusion of RbF is 6300 calories. Calculate the incre the entropy of 1 mole of RbF when it is heated from 300 to 1200K. (20 points)