CHEM 001A Lecture Notes - Lecture 17: Joule, Enthalpy

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14 Dec 2017
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Hess"s law of constant heat of summation: to the sum of the h rxn values of the constituent reactions. The h rxn for a reaction that is the sum of two or more reactions is equal. Ch 4 (g) + h 2 o(g) co(g) + 3h 2 (g) Co(g) + 3h 2 (g) + h 2 o(g) 4h 2 (g) + co 2 (g) Ch 4 (g) + 2h 2 o(g) 4h 2 (g) + co 2 (g) If the reaction is reversed , the sign of h changes. If the coefficients of a reaction are multiplied by an integer, h is. 6no(g) + 3n 2 (g) + 3o 2 (g) h = 3(-180 kj) = -540 kj multiplied by the same integer. Using the following data, calculate the h rxn for the reaction: C 2 h 6 (g) + 7/2 o 2 (g) 3h 2 o(l) + 2co 2 (g) h rxn = -1560 kj.

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