predict the enthalpy of reaction from the average bond enthalpies for the following reaction 2C2H6(g) +...
Bond Enthalpy (kJ/mol)
H-H 436.4
H-O 460
C-H 414
C-C 347
C=C 620
C-O 351
O-O 142
O=O 498.7
C=O 745
C=O 799
(carbon
dioxide)
Homework Answers
To calculate the total enthalpy of the reactant we add the enthalpy from each bond on the left side of the equation.
2 C-C: 2X347 = 694kJ
12 C-H: 12x414 = 4968 kJ
7 O-O: 7x498.7 = 3491 kJ
To calculate the total enthalpy of the products we add the enthalpy from each bond on the right side of the equation
8C=O: 8x799 = 6392kJ
12 H-O:12x460 = 5520 kJ
Delta H = (reactants)-(products)
Delta H = (694kJ + 4968kJ + 3491 kJ) - (6392kJ + 5520kJ)
Delta H = -2759kJ
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predict the enthalpy of reaction from the average bond enthalpies for the following reaction 2C2H6(g) +...
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