Chemistry

Chemistry

Problem

Which of the following expressions best represents the enthalpy change, ΔHrxn\Delta H_{\mathrm{rxn}}, of a chemical reaction when average bond energies are used? a) ΔHrxn=∑E(bonds formed)−∑E(bonds broken)\Delta H_{\mathrm{rxn}}=\sum E(\text{bonds formed})-\sum E(\text{bonds broken}) b) ΔHrxn=∑E(bonds broken)∑E(bonds formed)\Delta H_{\mathrm{rxn}}=\dfrac{\sum E(\text{bonds broken})}{\sum E(\text{bonds formed})} c) ΔHrxn=∑E(bonds broken)−∑E(bonds formed)\Delta H_{\mathrm{rxn}}=\sum E(\text{bonds broken})-\sum E(\text{bonds formed}) d) ΔHrxn=∑E(bonds broken)+∑E(bonds formed)\Delta H_{\mathrm{rxn}}=\sum E(\text{bonds broken})+\sum E(\text{bonds formed})

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