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Air contains 79% N(2) and 21% O(2) by vo...

Air contains `79% N_(2)` and `21% O_(2)` by volume. If the barometric pressure is `750 mm Hg`. The partial pressure of oxygen is

A

157.5 mm of Hg

B

175.5 mm of Hg

C

3125.0 mm of Hg

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
According to Avogadro's law, equal volume of gases under similar conditins contain same number of molecules or moles
`:.` Mole fraction of `O_(2) = 0.21`
Hence, Partial pressure of `O_(2) = 0.21 xx 750 = 157.5 mm " of " Hg`
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