9:00 Ms. Seema, just like I stated in your previous videos, if you are multiplying the number of moles in the equation by the standard enthalpy change, which is in the units if Kj/mol, then your final enthalpy change will not be having the units of KJ/mol because the moles will have gotten canceled while putting the value of the number of moles in the equation. This is the only way it adds up to be an "Extensive property" otherwise "Intensive property" will it be.
Kittu Saride delta Hf is The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states. ... For an element: the form in which the element is most stable under 1 bar of pressure.
