Chemistry Question - Thermodynamics

[paved88]

This is a question I have for my lab report "Determining the Enthalpy of a Chemical Reaction". I feel like the answer is probably right in front of my face, I just don't know how to start.

 

The first data analysis problem was to find q of each reaction, which I was able to do.

 

Then it instructs me to "calculate the enthalpy change, ΔH, for each reaction in terms of kJ/mol of each reactant".

 

I understand what enthalpy is, for the most part, but I don't really know what to do. You find the enthalpy change for a reaction as the enthalpy of the products - the enthalpy of the reactants, right? But I don't know how to calculate the enthalpy change for each reactant, is that a given value? I know that there are given thermodynamic values available for me to calculate that; is that all I do? I know the names of the products and reactants for each reaction, so do I need to do ΔHreaction = ΣΔHf (Products) - ΣΔHf (Reactants), or is there something I need to do involving the heat energy (q) of the reactions?

 

This is for AP Chemistry, a high school course. Please help if you can, thank you.

[Cap'n Refsmmat]

All you have to do is look up the enthalpies of the products and the reactants and subtract. It's as easy as it looks.

 

I took AP Chem a year ago, so of course I might have forgotten some key detail, but I believe this is correct...

[paved88]

Wow yeah I figured that's what I was supposed to do. Thanks so much!

[hermanntrude]

dont forget that you have to multiply each product and each reactant by its stoichiometric coefficient