Calculate $U_{r m s}$ of molecules of $H_{2}$ at $1 a t m$ , if density of $H_{2}$ is $0.00009 g / c c$ .

180

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182.6

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190

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190.2

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Solution

The correct option is B 182.6
The rms speed of hydrogen is $u = \sqrt{\frac{3 P}{d}} = \sqrt{\frac{3 \times 1}{0.00009}} = 182.6 c m / s e c$

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