Question

Please help!

Calculate the standard change in enthalpy, ΔH°rxn, for the decomposition of calcium carbonate to calcium oxide

CaCO3 (s) → CaO (s) + CO2 (g) Given that:

ΔH°f CaCO3 (s) = -1206.9 kJ/mol
ΔH°f CaO (s) = -635.1 kJ/mol
ΔH°f CO2 (g) = -393.5 kJ/mol
bobpursley
Hess' Law:

Hr=--635.1 kJ-393.5kJ-(-1205.9)kJ

In my head, looks like about it is endothermic (absorbs heat). I bet that is why limestone has to be heated in a furnace to make quick lime.

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