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The number of air molecules in a room of...

The number of air molecules in a room of capacity `30 m^3` at a temperature of `27^@C` and one atmosphere pressure. Given Boltzmann constant `k = 1.38 xx 10^(-23)JK^(-1)` :

A

`6.1 xx 10^(26)`

B

`7.3 xx 10^(26)`

C

`6.1 xx 10^(23)`

D

`7.3 xx 10^(23)`

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