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Silver $$(atomic mass \, = \, 108 g \, mol^{-1})$$ has density of $$10.5 g/cm^3$$. The number of silver atoms on a surface area of $$10^{-12}m^2$$ can be expressed in scientific notations as $$ Y \, \times \, 10^X$$. The value of X is :


Solution

Density of silver $$= 10.5 g /cm^{3}$$
surface area $$=10^{-12}m^{2}$$
Number of mole $$=\dfrac{10.5\times 10^{6}\times 10^{-12}}{108}mol/m$$
                            $$=10^{-7} mol/m$$
Number of atom $$=6.022 \times 10^{23}\times 10^{-1}mol/m$$
                             $$=6.022\times 10^{16} mol/m$$
                        $$X=16$$

Chemistry

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