Latent heat and Hess's law questions

Latent heat of fusion is

heat energy required to change one mole of a substance from solid state to liquid state

change in ∆fusH equation

H20(s) --> H20(l)

Latent Heat of Vaporization is

heat energy required to change one mole of a substance from liquid to gaseous state

change in ∆vapH equation

H2O(l) --> H2O(g)

latent heat of sublimation is

heat energy heat energy required to change one mole of a substance from solid to gaseous state

change in ∆subH is

H2O(s) --> H2O(g)

∆rH

change in heat of the reaction

∆cH

change in heat due to combustion

alway with O2 on the reacants and one mole of reacant

∆fH

change in formation

what is formed on the product side and for 1 mole only

Elements that go is pairs

H₂

O₂

N₂

F₂

Cl₂

Br₂

I₂