Mole ConceptHard

Question

On heating KClO3 at a certain temperature, it is observed that one mole of KClO3 yields one mole of O2. What is the mole fraction of KClO4 in the final solid mixture containing only KCl and KClO4, the latter being formed by parallel reaction?

Options

A.0.50
B.0.25
C.0.33
D.0.67

Solution

2KClO3(s) → 2KCl(s) + 3O2(g)

2/3 mole 2/3 mole 1 mole

4KClO3(s) → 3KClO4(s) + KCl(s)

1/3 mole 1/4 mole 1/12 mole

Mole fraction of KClO4 =

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