A gas X diffuses three times faster than another gas Y under identical conditions. If and represent the vapour densities of gases X and Y respectively, calculate the exact integer value of the ratio .

Question

A gas X diffuses three times faster than another gas Y under identical conditions. If $D_X$ and $D_Y$ represent the vapour densities of gases X and Y respectively, calculate the exact integer value of the ratio $D_Y / D_X$.

Prashant Kotian · Accepted Answer

Correct answer: 9. According to Graham's Law, . Given that , we substitute to get . Squaring both sides yields .

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