Answer : The number of atoms of cobalt are, [tex]2.246\times 10^{22}[/tex]
Explanation : Given,
Mass of cobalt sample = 2.2 g
Molar mass of Cobalt = 58.93 g/mole
First we have to calculate the moles of cobalt.
[tex]\text{Moles of }Co=\frac{\text{Mass of }Co}{\text{Molar mass of }Co}=\frac{2.2g}{58.93g/mole}=0.0373moles[/tex]
Now we have to calculate the number of atoms present in cobalt sample.
As, 1 mole of cobalt sample contains [tex]6.022\times 10^{23}[/tex] number of cobalt atoms
So, 0.0373 mole of cobalt sample contains [tex]0.0373\times 6.022\times 10^{23}=2.246\times 10^{22}[/tex] number of cobalt atoms
Therefore, the number of atoms of cobalt are, [tex]2.246\times 10^{22}[/tex]
