Question

solve this question with complete steps.​

Answer 1

Answer:

The compound is Al2(SO4)3.18 H2O.

Explanation:

Atomic weight of Aluminium = 26.98 g

In Al2(SO4)3.x H2O , we have two aluminium atoms, So, 26.98 x 2 = 53.96 g

Given, the compound has 8.2% aluminium by mass,i.e,

8.2 % of X = 53.96

Therefore, X = 658.05

This is the molecular mass of the compound including the water molecules.

Molar mass of Al2(SO4)3 = 342.1509 g/mol

Therefore, 658.05 - 342.1509 = 315.8991 which is equal to the mass of all the water present.

Hence, mass of water / molar mass of water = 315.8991 / 18 = 17.55 ≈ 18.