How much heat (in kilojoules) is evolved or absorbed in the reaction of 2.90g of Fe2O3 with enough carbon monoxide to produce iron metal?

Question

Fe2O3 + 3CO ---> 2Fe + 3CO2 dH=-24.8kJ

How do you find q (of the 2Fe in kJ).

Answer 1

Pure substances have heat formation (delta Hf) of zero.

-24.8 kJ x (2.90g Fe2O3/molar mass Fe2O3) = -??
The minus sign means heat is evolved.