Chemistry

Chemistry

Problem

Using the standard enthalpies of formation given below, determine the standard enthalpy change, ΔHrxn∘\Delta H^{\circ}_{\text{rxn}}, for the reaction CaO(s)+CO2(g)→CaCO3(s)\text{CaO}(s)+\text{CO}_2(g)\rightarrow\text{CaCO}_3(s). ΔHf∘(CaO,s)=−635.5 kJ mol−1\Delta H_f^{\circ}(\text{CaO},s)=-635.5\,\text{kJ mol}^{-1} ΔHf∘(CO2,g)=−393.5 kJ mol−1\Delta H_f^{\circ}(\text{CO}_2,g)=-393.5\,\text{kJ mol}^{-1} ΔHf∘(CaCO3,s)=−1207.0 kJ mol−1\Delta H_f^{\circ}(\text{CaCO}_3,s)=-1207.0\,\text{kJ mol}^{-1} a) +178 kJ+178\,\text{kJ} (endothermic) b) +242 kJ+242\,\text{kJ} (endothermic) c) −178 kJ-178\,\text{kJ} (exothermic) d) −571.5 kJ-571.5\,\text{kJ} (exothermic)

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