Question

Choose the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively and its molecular mass is 160. *

(a) FeO

(b) Fe₃O₄

(c) Fe₂0₃

(d) FeO₂

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Answer 1

Answer:

c.Fe2O3

Explanation:

Answer Mass % of iron = 69.9 % [Given] Mass % of oxygen = 30.1 % [Given] Fe : O = 1.25 : 1.88 Convert in simple ratio we get Fe : O = 2 : 3 The empirical formula of the iron oxide is Fe2O3.