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1L of air contains 21% of oxygen by volu...

1L of air contains 21% of oxygen by volume at STP. What is the number of moles of oxygen in 1L of air?

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Verified by Experts

At STP, volume of `O_(2)` present in 1 L air is 0.21 L.
At STP, number of moles present in 22.4L`O_(2)=1`
`therefore`At STP, no. of mole present I 0.21L `O_(2)=(0.21)/(22.4)`
`=9.375xx10^(-3)`
`therefore`At STP, no of moles of `O_(2)` present in 1L air `=9.3375xx10^(-3)`.
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