Heat of reaction(H rxn ) = bond energy of products - bond energy of reacants We

Question

Heat of reaction(Hrxn) = bond energy of products - bond energy of reacants

We have :

(i) In products

4 x 2O-H bonds , sum of their bond energy = 4 x 463 kJ/mol x 2mol = 3704 kJ

2 x CO bonds ,  sum of their bond energy = 2 x 1072 kJ/mol x 1mol = 2144 kJ

(ii) In reactants

2 x 4 C-H bonds , sum of their bond energy = 2 x 413kJ/mol x 4mol = 1652 kJ

3 x O=O bonds, sum of their bond energy = 3 x 495 kJ/mol x 1 mol = 1485 kJ

Heat of reaction(Hrxn) = 3704 kJ + 2144 kJ - {1652 kJ + 1485 kJ} = 2711 kJ

this is for 2 mol CH4

per mol = 2711 kJ / 2 mol = 1355.5 kJ/mol

Ans = 1.35 x 103 kJ/mol

Explanation / Answer

go 5 3 7 3288351 5536410975 1 2 2 2 2 2 2 1 1 1 B-IB-II 303489 690359 412237 65173 49002 10-4265 HFC.. C C C O O N N S go 671693319 363691693 454324433

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