Chemistry

Chemistry

Problem

For the reaction 2 NO2(g)→N2O4(g)2\,\text{NO}_{2}(g) \rightarrow \text{N}_{2}\text{O}_{4}(g) the molar enthalpy change is ΔHrxn=−120 kJ mol−1\Delta H_{\text{rxn}}= -120\,\text{kJ}\,\text{mol}^{-1}. If the reaction is written in the reverse direction, which of the following is the molar enthalpy change for the reverse reaction? a) −120 kJ mol−1-120\,\text{kJ}\,\text{mol}^{-1} b) +120 kJ mol−1+120\,\text{kJ}\,\text{mol}^{-1} c) −60 kJ mol−1-60\,\text{kJ}\,\text{mol}^{-1} d) +60 kJ mol−1+60\,\text{kJ}\,\text{mol}^{-1}

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