Which ∆H Should Be Used in Chemical Equations and Potential Energy Diagrams?

[rowkem]

So,

I did 5 labs where I burned certain things and found the temp. diff. in the calorimeter. That said, I calculated the ∆H for the entire system, the ∆H per gram of system substance, and the ∆H per mol of system substance.

Im wondering which ∆H I should be putting into my chemical equation for the reaction, as well the ∆H I should be putting into my potential energy diagram? I have a feeling its the ∆H per mole but, I'd like a second opinion. Thanks,

 

[rowkem]

Anyone?

 

[chemisttree]

You should do it on a per mole basis.

 

[LtStorm]

Most likely you want to use the mols of the substance in your equations. Write out a proper unit formula and you can see for sure whether you need the mols or grams based on what cancels and what you end up with.