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The number of atoms in 4.25g of $NH_3$ is approximately

$\begin{array}{1 1}(a)\;1\times 10^{23}&(b)\;1.5\times 10^{23}\\(c)\;2\times 10^{23}& (d)\;6\times 10^{23}\end{array} $

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17gm of $NH_3=6.023\times 10^{23}$ mole
$\therefore$ 4.25g of $NH_3=\large\frac{6.023\times 10^{23}}{17}$$\times 4.25$
$\therefore$ No of atoms in $NH_3=\large\frac{4\times 6.023\times 10^{23}}{17}$$\times 4.25\approx 6\times 10^{23}$
$\therefore$ The option is (d) $6\times 10^{23}$ .
answered Mar 25, 2014 by sreemathi.v

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