# Enthalpy of formation

1. Nov 3, 2006

### ubiquinone

Hi, I have a question involving enthalphy of formation. I tried doing this problem but I couldn't seem to get the right answer. I was wondering if anyone here may please help me out. Thanks.

Question: How much heat is evolved when 13.39 moles of CO(g) is burned in excess oxygen.
$$2CO(g) + O_2(g)\rightarrow 2CO_2(g)$$
Molar enthalpies are
$$CO=-110.5 kJ/mol$$
$$O_2=0.0$$
$$CO_2=-393.5 kJ/mol$$

2. Nov 6, 2006

### cheechnchong

you figure out the Change of Enthalpy (change of H) of overall equation, and then multiply by 13.39 moles of CO to get energy (KJ).

just to make sure...

Change of H = [(2)(-110.5KJ)] -[(2)(-110.5KJ)] = ?? KJ

then mult ?? KJ by 13.39 mol

does it give you the right answer?? would like to know