To find the ΔHrxn, we need to use the Hess's Law where we have to rearrange the given equations to get the desired reaction.
Calculate ΔHrxn for the reaction CaO(s) + CO2(g) → CaCO3(s) given these reactions and their ΔH values:
Express the enthalpy in kilojoules to one decimal place.
Ca(s) + CO2(g) + 1/2O2 → CaCO3 (s) ΔH = −814.1 kJ
2Ca(s) + O2(g) → 2CaO(s) ΔH = −1269.8 kJ
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