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The most probable speed of 8 g of H₂ is 200 ms^-1 average kinetic energy (neglect rotational and vibrational energy) of H₂ gas is :

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120 J

240 J

none of these

480 J

answer is B.

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Detailed Solution

$u_{mp} = \sqrt{\frac{2 RT}{M}} 200 = \sqrt{\frac{2 RT}{2 \times 10^{- 3}}} = RT = 40 Average K.E. = \frac{3}{2} nRT = \frac{3}{2} \times \frac{8}{2} \times 40 = 240 J$

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