Find the mass of copper sulfide 2, which is formed by the interaction of 3.2 g of copper with sulfur.

1. Let us write the reaction equation for the formation of copper sulfide (2):

Cu + S = CuS;

2.find the chemical amount of copper:

n (Cu) = m (Cu): M (Cu) = 3.2: 64 = 0.05 mol;

3.determine the amount of the formed copper sulfide:

n (CuS) = n (Cu) = 0.05 mol;

4.Calculate the mass of the obtained sulfide:

m (CuS) = n (CuS) * M (CuS);

M (CuS) = 64 + 32 = 96 g / mol;

m (CuS) = 0.05 * 96 = 4.8 g.

Answer: 4.8 g.