Question

As the temperature is raised from 20ºC to 40ºC, the average
kinetic energy of neon atoms changes by a factor of which
of the following ?
(a) 313/293
(b) √(313/ 293)
(c) 1/2
(d) 2

Answer 1

The temperature of the system changes by K (40) / K (20) = √313 / 293

Option (B) is correct.

Explanation:

Kinetic energy K.E =  3/2 RT

K.E v T

20 °c ---> 40 °C

K.E = 3/2 RT

K (40) / K (20) =  T (40) / T (20)

K (40) / K (20) = 273 + 40 / 273 + 20

K (40) / K (20) =   √313 / 293

Thus the temperature of the system changes by K (40) / K (20) = √313 / 293

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Calculate the volume (in cm^3) of air expelled from a vessel containing 0.4 litres of it at 250 K, when it is heated to 27 degree Celsius at the same pressure  ?

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