The empirical formula of a crystalline iron compound is $Fe_2(SO_4)_3$. It is used in water and sewage treatment to remove suspended impurities. The percentage composition of iron,sulfur,and oxygen in this compound is respectively......
- A$28, 24, 48$
- B$24, 28, 48$
- C$24, 48, 28$
- D$28, 28, 44$
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