Standard Enthalpy of Formation

[305174946]

The literal definition for enthalpy of formation is that 1 mol of a compound is formed from pure elements in their stable form. My questions are does it always have to be 1 mol of the product, and are we meant to memorize the standard forms of all elements?

[arif_latif_2G]

1. It always represents 1 mol of the product so if you can multiply by the number of moles necessary.
2. We will probably not need to memorize them.

[annabel 2A]

We don't need to memorize them.

[Rachana Jayaraman 1H]

I think that the one mole of the substance correlates to its enthalpy of formation since the units is kJ/mol. Usually the reactions are written such that the coefficient of the substance is 1, but if you don't have exactly one mole, you multiply the enthalpy of formation by the number of moles.
Also it is good to know the standard states of common elements such as N2, O2, F2, CL2, I2, Br2, etc.