The value of universal gas constant is $8.3 J / m o l e / K,$ the mean kinetic energy of $32 g m$ of oxygen at $- 73 ° C$ will be

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$480 J$

$4980 J$

$100 J$

$2490 J$

answer is C.

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Detailed Solution

$n = \frac{32}{32} = 1; translational kinetic energy : KE = \frac{3}{2} nRT = \frac{3}{2} \times 1 \times 8.3 \times (273 - 73) \Rightarrow KE = 2490 J$

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