The percentage of oxygen in potassium chlorate is:

35.5

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39.18

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Solution

The correct option is B 39.18
The molar mass of $K C l O_{3} = 39 + 35.5 + 48$ g

$= 122.5$ g

The percentage of oxygen $(O) = \frac{48}{122.5} \times 100$ %

$= 39.18$ %

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= 122.5

Calculate the percentage composition of each element in Potassium chlorate, $K C l O_{3}$

Calculate the percentage composition of :
potassium chlorate, $K C l O_{3}$

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