Question

Calculate the number of moles for $12.044\times {10}^{23}$a number of $\mathrm{He}$ atoms (finding mole from number of particles).

Answer 1

The number of moles can be calculated using the formula:

$$\begin{gathered} \mathrm{n}=\frac{\mathrm{Number}\mathrm{of}\mathrm{molecules}\left(\mathrm{N}\right)}{\mathrm{Avogadro}\text{'}\mathrm{s}\mathrm{Number}\left({\mathrm{N}}_{\mathrm{A}}\right)} \\ \mathrm{n}=\frac{12.044\times {10}^{23}}{6.022\times {10}^{23}{\mathrm{mol}}^{-1}} \\ \mathrm{n}=2\mathrm{moles} \\ \mathrm{Therefore},\mathrm{the}\mathrm{number}\mathrm{of}\mathrm{moles}\mathrm{are}2. \end{gathered}$$