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If Cp of water is 45T J/^oC, what is the enthalpy change of water from 6^oC to 8^oC?

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If Cp of water is 45T J/^oC, what is the enthalpy change of water from 6^oC to 8^oC?

(a) 7 J

(b) 14 J

(c) 28 J

(d) 56 J

I got this question in unit test.

This intriguing question comes from Phase Transitions topic in chapter Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

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The correct choice is (b) 14 J

To explain I would say: ∆H = 6∫^8T.dT = (8^2 – 6^2)/2 = 14 J.

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