Answer: The moles of melatonin are 0.000043
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number
of particles.
To calculate the moles, we use the equation:

Given mass of melatonin = 0.01 g
Molar mass of melatonin
= 232.28 g/mol

Thus the moles of melatonin in 0.01 g are 0.000043
In a reduction-oxidation or better known as REDOX reaction, the substance that reduces the oxidation state is known as the substance that is REDUCED. It serves as the oxidizing agent. Thus, Au3+ in this number is considered as the oxidizing agent.
All except for absorption of heat
Two moles because one moles would be 6.02×10 23 atoms 2 moles would equal twice that number of atoms