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  4. Number of atoms in the following samples of substances is largest in :

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Q. Number of atoms in the following samples of substances is largest in :

JEE MainJEE Main 2013Some Basic Concepts of Chemistry

Solution:

$4g$ of hydrogen = 4 mole of hydrogen
$= 4 \times 6.023 \times 10^{23}$ atoms
$71.0$ gm of chlorine $\frac{71.0}{71.0}=1$ = moles of chlorine
$= 6.023 x 10^{23}$ atoms
$127$ gm of iodine $=\frac{1}{2}$ mole of $I_2$
$=\frac{127}{254}=6.023\times10^{23}\times\frac{1}{2}$ atoms
$48., gm$ of magnesium
$=\frac{48.0}{24.0}=2\times6.023\times10^{23}$ atoms
$\therefore 4.0\,gm\,H_2$ has largest number of atoms.