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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) 50 J(b) 60 J(c) 80 J(d) 110 JThe question was asked during an interview.I'm obligated to ask this question of Applications of Humidity Chart in portion 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 |
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Answer» CORRECT answer is (d) 110 J To elaborate: ∆H = 10(20 – 15) + 0.5*[20(20 – 15) + 20] = 50 + 60 = 110 J. |
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