Asked by Rose Bud

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

should i be using a enthalpy reaction table?
Answered by DrBob222
Yes. Use the delta Ho formation tables.
dHrxn = (n*dH products) - (n*dH reactants)
Answered by Rose Bud
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
Answered by DrBob222
Is that good? A +178.3 kJ for dHo means it is an endothermic reaction
Answered by Judy
2 NO + O2 -> 2NO2


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