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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 JThe question was asked during an interview for a job.Asked question is from Applications of Humidity Chart topic in chapter Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances of Basic Chemical Engineering

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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