Question

Copper metal can be obtained by heating copper oxide in the presence of carbon monoxide, CO, according to the reaction:
CuO(s) + CO(g) --> Cu(s) + CO2(g)

Calculate Delta H° in kJ using the following thermochemical equations.

Reactions
2CO(g) + O2(g) --> 2CO2(g) DeltaH° -566.1
2Cu(s) + O2(g) --> 2CuO(s) DeltaH° -310.5

Answer 1

Take 1/2 equation 2.
Take 1/2 equation 2 and reverse it (and delta H).
Add the two.

Answer 2

Delta H equals to -876.6