-623.1 kJ/mol is equal to -623.1 kJ.
explanation
To convert -623.1 kJ/mol to kJ, we simply drop the per-mole unit and leave the kJ unit.
Therefore, -623.1 kJ/mol is equal to -623.1 kJ.
This is because kJ/mol is a measure of molar enthalpy, which represents the amount of energy that is absorbed or released per mole of a substance during a chemical reaction.
In this case, the negative sign indicates that the reaction is exothermic, meaning that it releases energy in the form of heat.
Thus, the answer is:
-623.1 kJ/mol is equal to -623.1 kJ.