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The number of moles of oxygen in 1 L of air containing 21% oxygen by volume, in standard conditions, is

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The number of moles of oxygen in 1 L of air containing 21% oxygen by volume, in standard conditions, is
A. 0.186 mol
B. 0.21 mol
C. 2.10 mol
D. 0.0093 mol
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Correct Answer - D
`O_(2)` in 1 L of air = 0.21 L
`:.` Moles of `O_(2) = (0.21)/(22.4) = 0.0093 mol`
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