The heat of reaction for a chemical reaction can be calculated by finding the su
ID: 966014 • Letter: T
Question
The heat of reaction for a chemical reaction can be calculated by finding the sum of the bond energies of the products and subtracting that from the sum of the bond energies of the reactants: Heat of reaction = Sum of the energy for the bonds broken - Sum of the energy for the bonds formed = Sum of reactant bond energies - Sum of product bond energies When calculating the sum of the bond energies, each bond in the reaction must be accounted for. For example, CH_4 is a reagent with a coefficient of 1 in the reaction. There are four C-H bonds in methane and one methane molecule per reaction, for a total of four C-H bonds on the reactant side. All four bonds must be accounted for when finding the sum of the bond energies for the reactants. Calculate the heat of reaction using the average bond dissociation energies given in the introduction and your answer to Part B for the reaction CH_4 + 2O_2 rightarrow CO_2 + 2H_2O Express your answer in kilojoules per mole to three significant figures.Explanation / Answer
CH4 ( 4 X C-H) + (2 X O=O) - (2 X C=O) - (4 X O-H) H2O treated as 4 O-H bonds
CH4 ( 4 X 410) + (2 X498) - (2 X 723) - (4 X 460)
1640+996-1446-1840 =
your answer should be -650.000 kJ/mol standard values taken from wikipedia
Thank you.
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