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Steam having CP = 105 J/^oC, is heated from 100^oC to 104^oC, what is the enthalpy change?

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Steam having CP = 105 J/^oC, is heated from 100^oC to 104^oC, what is the enthalpy change?

(a) 210 J

(b) 420 J

(c) 630 J

(d) 840 J

I had been asked this question in examination.

The question is from Heat Capacity Equations in portion Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

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Right choice is (b) 420 J

The best I can explain: ∆H = 100∫^104105.dT = 105*4 = 420 J.

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