NTA Abhyas JEE Main2020ChemistrySome Basic Concepts of ChemistryPractice

245 g impure sample of K C l O 3 s on heating gives 12 g O 2 g according to 2 KClO 3 s → 2 KCl s + 3 O 2 g Calculate % purity of sample ?

Correct answer

12.5

Step-by-step solution

2 KClO 3 → 2 KCl + 3 O 2 Let the % purity = x Mole of K C l O 3 = 245 122.5 × x 100 = 2 x 100 Mole of O 2 = 2 x 100 × 3 2 2 x 100 × 3 2 × 32 = 12 (% purity of sample) x = 12 .5

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