The mass of zinc sulfide formed by heating 10 g of zinc and 10 g of sulfur is …

Zn + S = ZnS – compounds, zinc sulfide is released;

We make calculations:
M (Zn) = 65.3 g / mol;

M (S) = 32 g / mol;

M (ZnS) = 97.3 g / mol.

Let’s determine the amount of starting materials:
Y (Zn) = m / M = 10 / 65.3 = 0.15 mol (deficient substance);

Y (S) = m / M = 10/32 = 0.3 mol (substance in excess);

Y (ZnS) = 0.15 mol since the amount of substances is 1 mol.

Calculations are made for the substance in deficiency.

Find the mass of the product:
m (ZnS) = Y * M = 0.15 * 97.3 = 14.59 g

Answer: Received zinc sulfide weighing 14.59 g