Chemistry · May / June 2017 · Paper 11 · Question 11
5070The mole and the Avogadro constant
A compound contains 70% by mass of iron and 30% by mass of oxygen. What is its empirical formula? [Ar: O, 16; Fe, 56]
- AFeO
- BFe2O3
- CFe3O2
- DFe3O4
As printed in the paper
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Correct answer: B. Fe2O3
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