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Heat of Reaction. Found two ways: 1. Using heats of formation for the substances 2. Using bond energies for the compounds Hrxn = Sum of ALL products – Sum of ALL reactants. 1. Heats of Formation. Calculate the Hrxn for the following reaction:
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Heat of Reaction • Found two ways: 1. Using heats of formation for the substances 2. Using bond energies for the compounds Hrxn = Sum of ALL products – Sum of ALL reactants
1. Heats of Formation Calculate the Hrxn for the following reaction: CH4(g) + 4F2(g) CF4(g) + 4HF(g)
2. Bond Energies Calculate the energy change for the following reaction: NH3(g) + Cl2(g) ClNH2(g) + HCl(g)