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AP EAMCET202125 Aug 2021Evening ShiftChemistrySolid StateActual

In Fe _ 0.96 O , Fe is present in +2 and +3 oxidation state, what is the mole fraction of Fe ²⁺ in the compound?

Options

  1. A12/25
  2. B25/12
  3. C1/12
  4. D11/12

Correct answer

D. 11/12

Step-by-step solution

Mole fraction is unit of amount of constituent, divided by total amount of all constituents in a mixture. Let us consider, there are ' x ' molecular fraction of Fe ²⁺ and (0.96-x) molecular fraction of Fe ³⁺ . Using charge conservation formula, We get, aligned x(+2)+(0.96-x)(+3)-2 & =0 2 x-3 x+2.88-2 & =0 x & =0.88 aligned Fraction of Fe ²⁺=0.88 and fraction of Fe ³⁺=0.96-0.88=0.08 Percentage of Fe ²⁺= 0.88 0.96 100=91.6 % Mole fraction of Fe ²⁺= 0.88 0.96 = 11 12 Hence, mole fraction of Fe ²⁺ is 11 12 .

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