The kinetic energy of N molecules of O2 ...

The kinetic energy of N molecules of `O_2` is x joule at - `123^@C`. Another sample of `O_2` at `27^@C` has a kinetic energy of 2x joule. The later sample contains:

N molecules of `O_2`

2N molecules of `O_2`

`N/2` molecules of `O_2`

`N/4` molecules of `O_2`

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