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What is the enthalpy change of 30^oC system if the heat capacity of air at 38^oC is 5 J/^oC and heat capacity of water vapor at 38^oC is 10 J/^oC, enthalpy of vaporization is 10 J, and the humidity is 60%?(a) 14 J(b) 39 J(c) 65 J(d) 94 J

Answer» Right answer is (d) 94 J

Explanation: ∆H = 5(38 – 30) + 0.6*[10(38 – 30) + 10] = 40 + 54 = 94 J.


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