thermochemistry
so i was studying thermochemistry and they use ΔH = -x kJ/mol, my doubt is what does that per mol refer to? per mol of what? [my teacher said that it refers to per mol extent of reaction but tbh i still do not get it]
7 Replies
@Dexter
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.thankyou sir, i think i now understand that it is used in some standard reactions and i will try to look up what exactly it means when it is used randomly i.e. without mentioning the context
also, i just saw the reaction he gave the example of so instead of writing the numerical value i used x instead 😅
iteachchem
Transcription requested by Emiway Bunty
Hi I've got a couple of thoughts on this we have written minus X is there any reason why you've written this or is this just like you've just picked it up from somewhere I'm asking this that if there's a negative sign that means that the reaction is in exothermic what are the negative sign imply it implies that your final energy is lower than your initial energy right and the difference in energy is released as heat of what energy of reactants energy of products energy of products are lower than that of reactants hence it's negative figure you're asking for mole of what so it's an awesome question right it's usually per mole of some definition out there like say Delta H not F that means that you're forming one mole of product and from its standard states then you have Delta H of combustion so you are burning one mole of something that is what per mole means now if you're going to be like a hey what if you have some random reaction per mole of what that is where things get a little complicated and that is what your teacher answered
+fsolved
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