How much chlorine will react with 12.8 g of copper?

Let’s write the reaction equation:

Cu + Cl2 = CuCl2

1. M (Cu) = 63.5 g / mol (the molar mass of copper is taken from the periodic table);

2.n (Cu) = m / M = 12.8 / 63.5 = 0.2 mol (n is the number of mol of copper, m is the mass of copper according to the condition);

3.n (Cl2) = n (Cu) = 0.2 mol (the coefficients in the equation are all the same);

Answer: 0.2 mol of chlorine enter into the reaction.