Question

How many $N{H}_3$ molecules are adsorbed on charcoal surface?

• A. $1.4\times {10}^{22}$
• B. $1.4\times {10}^{23}$
• C. $1.4\times {10}^{21}$
• D. $1.4\times {10}^{20}$

Answer 1

The correct option is A $1.4\times {10}^{22}$

Surface area occupied by one $N{H}_3$ molecule $=\pi r^2$.

$=3.14\times {(\frac{0.3\times {10}^{-9}}{2})}^2=7.065\times {10}^{-20}{m}^2$

Total surface area $={10}^3{m}^2$.

Number of $N{H}_3$ molecules adsorbed $=\frac{{10}^3}{7.065\times {10}^{-20}}$

$=1.415\times {10}^{22}$ molecules.