What is the percentage by mass of oxygen in Al2(SO4)3. 2H2O?
[Al = 27, S = 32, H = 1, O = 16]
- 14.29%
- 25.39%
- 50.79%
-
59.25%
The correct answer is: D
Explanation
Al2(SO4)3. 2H2O2 * 27 + 3*32 + 14 * 16 + 4 * 1 =
54 + 96 + 224 + 4 = 378
% O2 = (224/378) * (100/1) = 59.25%