7.34 Calculate the enthalpy difference between water at 5 bar and 50C and steam at 5 bar and 400C (a) Using the steam tables. 476 Energy Balances for Nonreaction Systems (b) Using the C, equations, heat of vaporization at the normal boiling point, and Watson's correlation with n = 0.38. (c) How much can the estimate obtained in (b) be improved if the steam tables are used to account for the pressure effects