What is the enthalpy change of 15oC system if the heat capacity of air at 20oC is 10 J/oC and heat capacity of water vapor at 20oC is 20 J/oC, enthalpy of vaporization is 20 J, and the humidity is 50%?

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1.	What is the enthalpy change of 15^oC system if the heat capacity of air at 20^oC is 10 J/^oC and heat capacity of water vapor at 20^oC is 20 J/^oC, enthalpy of vaporization is 20 J, and the humidity is 50%?
A.	t50 J
B.	t60 J
C.	t80 J
D.	t110 J
Answer» E.

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