Magnesium(Mg) does not forms diatomic molecules.
The name of the compound CuCl2 is copper(ll)chloride.
Hope this helps you.
Answer:
Enthalpy of solution is 583.67 J
Explanation:
The mass of water is 143 g
The mass of NaCl added = 12g
Total mass of solution will be = 
The specific heat of solution = specific heat of water = 4.184 J /g °C
The initial temperature = 22.5°C
Final temperature =21.6°
The change in temperature = 
The enthalpy of solution will be equal to the heat change in the solution.
The heat change of solution will be calculated as:


Thus the enthalpy of solution is 583.67 J (Endothermic reaction)
I think the answer is 26,88 liters