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I'm consulting one of higher classes books to study chemistry. I had been studying Graham's Law and question related to rate of diffusion. I came across a question[1] which says:

Calculate the ratio of diffusion of $\ce{SO2}$ and $\ce{CO2}$ under constant temperature and pressure.

The question mentioned the mass of elements as following: $\ce{S}=32$, $\ce{O}=16$, $\ce{C}=12$.

My solution of the question:

Molecular mass of $\ce{SO2}=32+32=64$

Molecular mass of $\ce{CO2}=12+32=44$

$$\frac{\textrm{Rate of diff. of}\ \ce{SO2}}{\textrm{Rate of diff. of}\ \ce{CO2}} = \sqrt{\frac{44}{64}} = \frac{\sqrt{11}}{4} $$

But the book has a different answer at the back, where it says $1:2$. I rechecked and performed all the maths again, but still cannot find this answer. Is the book incorrect, or have I made a mistake? If the latter, please help me find it.

  1. D. N. Singh: Basic Concepts of Inorganic Chemistry, 2nd Edition. Pearson India, December 2011. ISBN: 9788131768617 URL of publisher
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  • 2
    $\begingroup$ If you made a mistake, I'm making the same. To me, your solution looks fine! $\endgroup$ – Klaus-Dieter Warzecha Apr 20 '15 at 7:56
  • $\begingroup$ I think you're right here as well... $\endgroup$ – Asydot May 1 '15 at 14:53

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