Calculate the δ h°rxn for the decomposition of calcium carbonate to calcium oxide and carbon dioxide. δ h°f [caco3(s)] = –1206.9 kj/mol; δ h°f [cao(s)] = –635.1 kj/mol; δ h°f [co2(g)] = –393.5 kj/mol

Explanation

The formula for calculating the enthalpy change of a reaction by using the enthalpies of formation of reactants and products is

                         CaCO₃(s) ⟶ CaO(s) + CO₂(g)

ΔH°f/kJ·mol⁻¹:    -1206.9         -635.1    -393.5

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if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation: