The number of moles of in of air containing oxygen by volume, at STP, is: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
The number of moles of $O_2$ in $1\text{ L}$ of air containing $21\%$ oxygen by volume, at STP, is:
Answer: C
💡 Solution & Explanation
$\text{Volume of } O_2 = 1\text{ L} \times 0.21 = 0.21\text{ L}$. <br>$\text{Moles} = V / 22.4 = 0.21 / 22.4 \approx 0.009375\text{ mol}$. [1, 2]
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