Q

What is the percentage of oxygen in Al2(SO4)3?

RRB Group D, 27-Sep-18 S-1 2018
✓ Answer: B 56.1%
For aluminium sulphate, Al2(SO4)3: Atomic masses: Al=27, S=32, O=16. Molar mass of Al2(SO4)3 = (2x27)+(3x32)+(12x16) = 54+96+192 = 342 g/mol. Mass of oxygen = 12x16 = 192 g/mol. Percentage of oxygen = (192/342)x100 = 56.14% ≈ 56.1%. Thus, oxygen constitutes approximately 56.1% by mass of Al2(SO4)3.
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