At STP, air contains $22.4$ % by volume of oxygen. The number of moles of oxygen present in $1$ L of air is:

0.1

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0.01

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Solution

The correct option is B 0.01
Let volume of air = 1 L

thereofre volume of oxygen = 0.224 L

moles of oxygen = $\frac{0.224}{22.4} = 0.01$

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