Question

How many moles of atoms are there in $9.0\mathrm{g}$ of aluminium?

Answer 1

The number of moles in Aluminum is calculated by:

Step1: Formula used-

Moles $=$Mass of the element($\mathrm{g}$)$/$Molar Mass(${\mathrm{gmol}}^{-1}$)

Step 2: Given-

Molar mass of aluminium $=27\mathrm{g}/\mathrm{mol}$

Given mass of aluminium $=9.0\mathrm{g}$

Step3: Calculation -

The number of moles present in $9.0\mathrm{g}$of Aluminum $$\begin{gathered} =9.0\mathrm{g}/27{\mathrm{gmol}}^{-1} \\ =0.33\mathrm{mol} \end{gathered}$$

Hence, $0.33$ moles are present in $9.0\mathrm{g}$ of aluminum.