# Question #c1a9b

$\Delta {H}_{r e a c t i o {n}^{\theta}}$ = $\Sigma {\Delta}_{f} {\left(P r o \mathrm{du} c t s\right)}^{\theta}$ - $\Sigma {\Delta}_{f} {\left(R e a c \tan t s\right)}^{\theta}$
$\Delta {H}_{r e a c t i o {n}^{\theta}}$ = $\Sigma {\Delta}_{f} {\left(P r o \mathrm{du} c t s\right)}^{\theta}$ - $S i g m {\Delta}_{f} {\left(R e a c \tan t s\right)}^{\theta}$
There is a list of $\Delta H$ that will tell you all of the energies that common compounds have. When given an equation simply add the energies of one side of the reaction equation and subtract them from the sum of the other side.