# Reaction Chemistry

1. Jan 10, 2005

Hello all

Let's say we are given:

$$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$$

We want to find $$\Delta_H$$ for the entire reaction.

Would I just use the formula:

$$\sum _i \Delta_H_i - \sum _j \Delta_H_j$$? In other words just look up enthalpies in book and subtract enthalpy of reactants from enthalpy of products?

Thanks

2. Jan 10, 2005

### dextercioby

IIRC,that's how it goes.To find the reaction enthalpy,u need to know the creation enthalpies for each of the components from the reaction.Pay attention with the signs.

Daniel.