Determine the mass fraction of chlorine in aluminum chloride.

In order to calculate the mass fraction of chlorine in aluminum chloride, it is necessary to find the ratio of the molar masses of chlorine atoms in the oxide molecule to the molar mass of aluminum chloride.

Trivalent aluminum chloride consists of three chlorine atoms and one aluminum atom.

M Cl3 = 35.5 x 3 = 106.5 grams / mol;

M AlCl3 = 27 + 35.5 x 3 = 133.5 grams / mol;

The mass fraction of chlorine in aluminum chloride will be:

K = M Cl3 / M AlCl3 = 106.5 / 133.5 = 0.798 = 79.8%;