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  • Try this! The kinetic energy of N molecules of O2 is x joule at -123ºC. Another sample of O2 at 27ºC has a kinetic energy of 2x. The latter sample contains _______ molecules of O2.

The kinetic energy of  N  molecules of O2 is  x  joule at  -123ºC. Another sample of O2 at 27ºC has a kinetic energy of 2x. The latter sample contains _______ molecules of O2.

  • Option 1)

    N

  • Option 2)

    N/2

  • Option 3)

    2N

  • Option 4)

    3N

 

Answers (1)

best_answer

As we learnt in 

Kinetic Theory of Gases -

Though the individual speeds are changing, the distribution of speeds remains constant at a particular temperature.

-

 

K.E_{O_{2}}= \frac{\frac{3}{2}\times \frac{N}{32}\times R\times 150}{\frac{3}{2}\times \frac{{N}'}{32}\times R\times 300}= \frac{x}{2x}                        

K.E_{O_{2}}= \frac{N\times 1}{N{}'\times 2}

N= N{}'          


Option 1)

N

Correct

Option 2)

N/2

Incorrect

Option 3)

2N

Incorrect

Option 4)

3N

Incorrect

Posted by

Aadil

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