Question

In $1g$ of a solid, there are $5\times {10}^{21}$ atoms. If one electron is removed from energy of $0.01\%$ atoms of the solid, the charge gained by the solid is :
(electronic charge is $1.6\times {10}^{19}C$ )

• A. $+0.08C$
• B. $+0.8C$
• C. $-0.08C$
• D. $-0.8C$

Answer 1

The correct option is A $+0.08C$

The number of electrons removed in total is given as,

$n=\frac{0.01}{100}\times 5\times {10}^{21}$

$n=5\times {10}^{17}$

The total charge removed is given as,

$q=ne$

$q=5\times {10}^{17}\times 1.6\times {10}^{-19}$

$q=-0.08C$

Thus, the charge gained by the solid is $+0.08C$.