$\mathbf{rate}\mathbf{=}\frac{\mathbf{1}}{\sqrt{{\mathbf{MM}}_{\mathbf{gas}}}}$

$\overline{)\frac{{\mathbf{rate}}_{\mathbf{gas}\mathbf{}\mathbf{1}}}{{\mathbf{rate}}_{\mathbf{gas}\mathbf{}\mathbf{2}}}{\mathbf{=}}\sqrt{\frac{{\mathbf{MM}}_{\mathbf{gas}\mathbf{}\mathbf{2}}}{{\mathbf{MM}}_{\mathbf{gas}\mathbf{}\mathbf{1}}}}}\phantom{\rule{0ex}{0ex}}\frac{{\mathbf{rate}}_{\mathbf{He}}}{{\mathbf{rate}}_{{\mathbf{NH}}_{\mathbf{3}}}}\mathbf{=}\sqrt{\frac{{\mathbf{MM}}_{{\mathbf{NH}}_{\mathbf{3}}}}{{\mathbf{MM}}_{\mathbf{He}}}}\phantom{\rule{0ex}{0ex}}{\mathbf{rate}}_{\mathbf{He}}\mathbf{=}{\mathbf{rate}}_{{\mathbf{NH}}_{\mathbf{3}}}\sqrt{\frac{{\mathbf{MM}}_{{\mathbf{NH}}_{\mathbf{3}}}}{{\mathbf{MM}}_{\mathbf{He}}}}$

The rate of effusion of NH_{3} is 2.40 mole/min. What would be the rate of effusion of He under the same conditions?

a) 2.40

b) 10.2

c) 1.54

d) 4.95

e) 0.56

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