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Two gases have densities 0.388 g L^(-1) ...

Two gases have densities 0.388 g `L^(-1)` and 0.097 g `L^(-1)`. What is the rate of diffusion of the first gas, if the second gas diffuses at the rate 10 cc `s^(-1)` under similar conditions ?

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5 cc `s^(-1)`
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