Hey, 
A mole is a unit of measure that helps us compare particles of any given substance and its mass. ... The molar mass, also known as molecular weight, is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule. The unit used to measure is grams per mole.
        
             
        
        
        
Answer:
I cant see the whole question but to my knowledge it is the 3rd law 
Explanation:
because the third law states what the applied force is when two objects interact
 
        
             
        
        
        
Convalent Bond energy is low