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19.7Kg of gold was recovered from a smuggler. How many atoms of gold were recovered? ( at. mass. of Au = 197 )

$\begin{array}{1 1}(a)\;100& (b)\;6.02\times 10^{23} \\(c)\;6.02\times 10^{24}&(d)\;6.02\times 10^{25}\end{array} $

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197g of Au=$6.023\times 10^{23}$atom
$\therefore$ 19700g of Au=$\large\frac{19700}{197}$$\times 6.023\times 10^{23}$
$\Rightarrow 6.023\times 10^{25}$atoms
Hence (d) is the correct answer.
answered Mar 25, 2014 by sreemathi.v
 

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