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# What do you mean by gram atomic mass. one million silver atoms weigh $1.79 \times 10^{16}\;g$ . Calculate the gram atomic mass of silver.

$\begin{array}{1 1} (a)\;107.8\;g\\(b)\; 117.8\;g\\ (c)\;20\;g \\ (d)\;30\;g \end{array}$

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A)
Solution :
Atomic mass of an element expressed in grams is the gram atomic mass
Number of silver atoms =1 million =$1 \times 10^6$
Mass of one million Ag atoms $= 1.79 \times 10^{16}\;g$
Mass of $6.023 \times 10^{23}$ atoms of silver $=1.79 \times 10^{6}\;g \times 6.023 \times 10^{23} \times 1 \times 10^{6}$
$\qquad=107.8\;g$