how to calculate enthalpy of combustions using values of ΔHf

Hi guys,
So basically, I need to calculate enthalpy of combustion but I saw my values are in ΔHf/kjmol. SO now im confused as to how to do the enthalpy cycle, should I do it as just enthalpy of formation ? or are there further steps.

Basically would it look like this? or how would the arrows be and how would I deduce the enthalpy of combustion

You've kind of got confused with bond enthalpy, which shows the bottom line as gaseous atoms, and formation enthalpy.

Check out this video:

Hi guys,
So basically, I need to calculate enthalpy of combustion but I saw my values are in ΔHf/kjmol. SO now im confused as to how to do the enthalpy cycle, should I do it as just enthalpy of formation ? or are there further steps.

Basically would it look like this? or how would the arrows be and how would I deduce the enthalpy of combustion

@smart ppl i.e @CoochieMan @xsowmix @Hellohsjakodsmka @cactus11235813 hop in here

also some1 check what i did pls

it looks right
they've given formation data so the arrows shld be pointing upwards which op made a lil mistake on

wait is what i did right??

yh yh it's right


why u surprised lol

Tbh Idk if this is right or not 😂

thank you so much man!!! so i just needa keep my arrows up thats all. Was your answer 3117.8 kjmol-1