A sample of wustite has the formula Fe_0.95O, with Fe present as Fe^2+ and Fe^3+ only. The percentage of the iron present as Fe^3+ is

JEE Main levelSingle correct optionDifficulty 2 of 3df028

A sample of wustite has the formula $Fe X_{0.95} O$ , with Fe present as $Fe X^{2 +}$ and $Fe X^{3 +}$ only. The percentage of the iron present as $Fe X^{3 +}$ is

For 1 O (

- 2

) there are 0.95 Fe. Let

x

Fe X^{3 +}

2 (0.95 - x) + 3 x = 2

gives

x = 0.10

. Fraction =

0.10/0.95 = 10.5%