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Problem $03\mathrm{.}057$E $-$ Superheated water vapor

Superheated water vapor at $180$ psia and $400F$ is allowed to cool at constant volume until the

temperature drops to $250F.$ Use data from the steam tables.

Problem $03\mathrm{.}057$E$.$c $-$ Enthalpy of superheated vapor

At the final state, determine the enthalpy. $($Round the final answer to three decimal places.$)$

The enthalpy is

Btu$/$lbm$.$