Question

Calculate the number of atoms in each of the following:

$16\mathrm{moles}\mathrm{of}\mathrm{He}$

Answer 1

He:

1. $\mathrm{He}$ symbol is used for Helium.
2. Helium is a noble gas.
3. It does not participate in bond formation.

Moles of Helium ($\mathrm{He}$) = 16

As we know,

$$\begin{gathered} \mathrm{number}\mathrm{of}\mathrm{moles}=\frac{\mathrm{no}.\mathrm{of}\mathrm{atoms}}{6.02\times {10}^{23}} \\ \mathrm{no}.\mathrm{of}\mathrm{atoms}=6.02\times {10}^{23}\times 16 \\ \mathrm{no}.\mathrm{of}\mathrm{atoms}=96.32\times {10}^{23} \end{gathered}$$

Hence, 16moles of He will have $96.32\times {10}^{23}$ atoms