# Chemistry - Enthalpy reactions

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What is the reaction enthalpy for CaCO3(s) --> CaO(s) + CO2(g)?

should i be using a enthalpy reaction table?

• Chemistry - Enthalpy reactions -

Yes. Use the delta Ho formation tables.
dHrxn = (n*dH products) - (n*dH reactants)

• Chemistry - Enthalpy reactions -

perfect, i got a positive 178.3 kj/mol, which makes since because CaCO3 releases a lot of energy when it breaks apart, so there was more energy released when breaking apart then needed to originally form CaCO3

Thank you

• Chemistry - Enthalpy reactions -

Is that good? A +178.3 kJ for dHo means it is an endothermic reaction

• Chemistry - Enthalpy reactions -

2 NO + O2 -> 2NO2

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