Find the formula of a chemical compound consisting of 60% copper and 40% zinc.

1. Let’s designate: m is the molecular weight of the compound, x is the number of copper atoms, y is the number of zinc atoms.

2. The relative atomic mass of copper is 64, the relative atomic mass of zinc is 65.

3. Let’s compose the following expressions:

0.6 = (64 * x) / m;

0.4 = (65 * y) / m;

1. Let’s express the molecular weight:

m = 64 * x / 0.6 = 106.667x;

m = 65 * y / 0.4 = 162.5y;

1. Equate expressions: 106.667x = 162.5y. Most suitable values: x = 3, y = 2.

Answer: the compound formula is Cu3Zn2.