Th<span>is is
dictated by the law of conservation of energy even in reactions. NO energy can
be destroyed or created. For an atom to gain electrons, another must have lost
the electrons, and vice versa. Additionally, reactions need to be in equilibrium
between both products and reactants</span>
The mass of one Au atom is 196.97 amu from periodic table and the mass of Avogadro's number of Au atoms is 196.97 g due to this is the mass of one mole of gold