Quick Revision - AS Enthalpy Changes

Quick blast through how to calculate the enthalpy change for a reaction using: Bond enthalpies, calorimetry results, enthalpy changes of formation and enthalpy changes of combustion.

[@hash-tag8065]

Very helpful. May God bless you & your family.
please make a video on moles revision as well if u can.

[@wisdomsimeon431]

I was revising this today! Brilliant
Great video :)

[@MaChemGuy]

Speaking Wisdom Glad you approve!

[@mashx2859]

You lifesaver!!! Please make more of these

[@oswin4715]

Is this all the calculations they can ask for enthalpy?

[@skepticz730]

Hi Sir, is hess's cycle not needed if you use Ep-Er for enthalpy of formation or Er-Ep for enthalpy of combustion?

[@MaChemGuy]

Skepticz As long as you get the correct answer! Sometimes they present the info as a cycle so worth knowing how they work

[@skepticz730]

Thank you.

[@DricusDuPlessis185]

For moles if you have 2 substances do you use the one which is in excess?

[@blackredce2655]

No u use the one that isnt in excess I think

[@DricusDuPlessis185]

@@blackredce2655 thats what i thought but i was doing a question today and the only way to get the right answer was use the one in excess OR i got the wrong one in excess not sure but i think your right

[@jasmin6391]

this was so helpful thankyou!!

[@MaChemGuy]

You're so welcome!