Mole ConceptHard
Question
A sample of iron oxide has FeO and Fe2O3 in the mole ratio 2: 1. It is partially oxidized to change this ratio to 1: 2. The number of moles of FeO oxidized per mole of initial mixture is
Options
A.0.2
B.0.333
C.0.4
D.0.5
Solution
2FeO → Fe2O3
2a mole a mole
(2a – 2x)mole (a + x)mole
From question, $\frac{a + x}{2a - 2x} = \frac{2}{1} \Rightarrow x = \frac{3}{5}a$
Hence, moles of FeO oxidized per mole of mixture
$= \frac{2x}{3a} = \frac{2}{3} \times \frac{3}{5} = 0.4$
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