how do I calculate the enthalpy of reaction per mole

Question

cuanchi · Answer

what values do you have? experimentally?

anonymous · Answer

Look up the standard enthalpies of formation for all of the reactants and products. (If you are given several reactions in the question, you can also manipulate them to get the target reaction -- suing Hess' Law).

Once you have all of the enthalpies of formation, use this method:

$$\color{green}{\Delta H^{\circ} _f =\sum n \Delta H^{^\circ}_f (\text{products}) -\sum n \Delta H^{^\circ}_f (\text{reactants}) }$$

where n represents the number of moles of each of the reactants and products in the balanced equation. If there is more than one mole of the target species in the balanced equation, divide the answer you get by that coefficient to express the answer per mole.