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Q 2 . ( a ) Predict the value for the enthalpy of vaporization for water at 2 0 0 C assuming steam to be
Qa Predict the value for the enthalpy of vaporization for water at assuming
steam to be an ideal gas. Calculate the percent error.
Hint:
b Suppose the steam tables started at kPa and we desired at
kPa. Predict and compare with the value from the steam tables.
Hint: ~
c Calculate the entropy change of a kg block of copper if the pressure changes from
kPa to MPa while the temperature remains constant. Use and
Hint: Use Maxwel's equations and
d Find the JouleThomson coefficient for steam at and MPa using both expressions
given in
Hint: Use and
e Verify the Clapeyron equation for Ra at kPa.
Hint: elT
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