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# Try this! - States of matter - JEE Main-2

Assuming that O2 molecule is spherical in shape with radius $2 \AA$, the percentage of the volume of O2 molecules to the total volume of gas at S.T.P. is :

• Option 1)

0.09%

• Option 2)

0.9%

• Option 3)

0.009%

• Option 4)

0.045%

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As we learnt in

Kinetic Theory of Gases -

Molecules of gases are very small and their actual volume is negligible in comparision to the empty space between them.

-

Required % $= \frac{4}{3}\times \frac{\pi \times \left ( 2\times 10^{-8} \right )^{3}\times 6\times 10^{23}}{22400}\times 100= 0.09 \%$

Option 1)

0.09%

Correct

Option 2)

0.9%

Incorrect

Option 3)

0.009%

Incorrect

Option 4)

0.045%

Incorrect

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