In which compound is the largest mass fraction of chlorine? Cl2O3 Cl2O Cl2O7

The mass fraction of chlorine will be equal to the fraction of the molar mass of chlorine in the compound.

To solve this problem, we will find the molar masses of these compounds and the molar masses of chlorine atoms in them. The ratio of the molar mass of chlorine atoms to the molar mass of the substance will indicate the mass fraction of chlorine.

A. Cl2O3

M Cl2 = 35.5 x 2 = 71 grams / mol;

M Cl2O3 = 35.5 x 2 + 16 x 3 = 119 grams / mol;

To Cl2O3 = M Cl2 / M Cl2O3 = 71/119 = 0.5966 = 59.66%;

B. Cl2O

M Cl2 = 35.5 x 2 = 71 grams / mol;

M Cl2O = 35.5 x 2 + 16 = 87 grams / mol;

To Cl2O3 = M Cl2 / M Cl2O = 71/87 = 0.8161 = 81.61%;

B. Cl2O7

M Cl2 = 35.5 x 2 = 71 grams / mol;

M Cl2O7 = 35.5 x 2 + 16 x 7 = 183 grams / mol;

To Cl2O7 = M Cl2 / M Cl2O7 = 71/183 = 0.3879 = 38.79%;

Chlorine content will be maximum in Cl2O. This is due to the fact that this compound has the minimum number of oxygen atoms.