Question

Calculate the number of silver atoms in one milligram ($0.001g$) of silver.( Atomic mass = $108$).

Answer 1

• The atomic mass of silver $108g$.
• Number of moles = $\frac{Massofsubs\tan ce\left(g\right)}{Molarmass}$

= $\frac{1\times {10}^{-3}g}{108g}$

= $9.259\times {10}^{-6}$ moles

• Number of silver atoms =$9.259\times {10}^{-6}\times 6.022\times {10}^{23}$

= $5.57\times {10}^{18}$atoms