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It is understood that more carbon atoms present in a hydrocarbon, the greater the density of the hydrocarbon.

But then why does $\mathrm{CH_{3}I}$ have a greater density than $\mathrm{C_{2}H_{5}I}$?

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    $\begingroup$ Because the iodides are not hydrocarbons, maybe? $\endgroup$ Aug 3, 2017 at 10:20
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    $\begingroup$ @OscarLanzi If so then the effect of iodide should be pronounced on both ethyl iodide and methyl iodide equally and more on ethyl iodide as it is having one more carbon? $\endgroup$ Aug 3, 2017 at 15:05
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    $\begingroup$ Spacing between iodine atoms in different size molecules. $\endgroup$ Aug 3, 2017 at 15:10

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For the same reason why a bucket of sand will weigh more than a bucket of rocks. Smaller molecules will result in a more dense, thus more heavy substance.

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