Hess's law states that: A. The overall enthalpy change for a reaction is independent of the route the reaction takes. B. Energy cannot be created nor destroyed, it can only change form.
O C. When the enthalpy changes under standard conditions, 1 mole of a substance is formed
from its elements.
O D. The enthalpy change when 1 mole of a substance undergoes complete combustion under
standard conditions is equal to molar masses of the compounds.