Answer:
[tex]5.78\times 10^{23}[/tex] molecules
Explanation:
m = Mass of Magnesium = 23.4 g
M = Molar mass of Magnesium = 24.305 g/mol
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
Number of moles is given by
[tex]n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{23.4}{24.305}\ \text{mol}[/tex]
Number of molecules is given by
[tex]nN_A=\dfrac{23.4}{24.305}\times 6.022\times 10^{23}=5.78\times 10^{23}[/tex]
The sample has [tex]5.78\times 10^{23}[/tex] number of molecules.
