endo or exo

Is a bond breaking?

Is bond breaking exo or endo?

decomposition reactions are usually endo because they require energy to break the bonds in a compound, with a few exceptions.
endo-bond breaking
exo-bond making

then why these values show this process as being exo?

it's an exception, they've calculated the enthalpy change.

you mean ammonium nitrate decomposition is not endothermic?

it's always best to calculate the enthalpy change to make sure whether a reaction is endo or exo because there are exceptions.
in this case, even though it's a decomposition reaction, it's exothermic.

but this shows presence of heat makes this endo. maybe something with the values is wrong... i just wanted to confirm what it really is. and im more confused than i ever was

only presence of heat does not make it endo, even exo reactions require heat because this is activation energy don't get confused. this is why enthalpy is calculated, to figure out whether there there is OVERALL intake or release of energy. it's correct don't worry.

then plz tell why Moles of products increased at high temperature? if its an exception and exo?

then plz tell why Moles of products increased at high temperature? if its an exception and exo?