Steam is generated in a boiler. If the initial water enters the boiler as saturated water at 1000 psi a (h=542.4 Btu/Ibm) and leaves as superheated steam at 950 psi a and 1000 F ( h= 1507.4 Btu/Ibm), how much heat is added to the steam to generate 1 Ib of steam at these conditions?