At $27^{o} C$ the average kinetic energy of 8 grams hydrogen is .......... times, the average kinetic energy of 8 grams of oxygen.

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Solution

The correct option is D 16
At constant temperature, equal masses of gas have average $K E$ inversely proportional to molecular weights of gases.
$\frac{K E_{1}}{K E_{2}} = \frac{32}{2} = \frac{16}{1}$

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