20 g of [tex]FeSO_4[/tex] contains [tex]7.94 \times 10^{22}[/tex] ions of [tex]Fe^2^+[/tex]
A mole is a unit to measure an amount of any substance which contains as many elementary particles as there in 12 g of Carbon 12.
A mole contains [tex]6.02214 \times 10^{23}[/tex] particles and this fixed number is called Avogadro’s number.
No. of moles is given by,
[tex]n =\frac{m}{M}[/tex]
where m = Given mass in grams
M = Molar mass
Here,
[tex]FeSO_4 \rightarrow Fe^2^+ + SO_4^2^-[/tex]
No. of moles of [tex]FeSO_4[/tex] = [tex]\frac{20g}{151.9gmol^-^1}[/tex] = 0.132 moles
No. of molecules of [tex]FeSO_4[/tex] = 0.132 x 6.022 x [tex]10^2^3[/tex] = 7.94 x [tex]10^2^2[/tex]
No. of molecules of [tex]FeSO_4[/tex] = no. of ions of [tex]Fe^2^+[/tex] = no of ions of [tex]SO_4^2^-[/tex]
Thus, no. of ions [tex]Fe^2^+[/tex] in 20 g of [tex]FeSO_4[/tex] is 7.94 x [tex]10^2^2[/tex]
Learn more about the mole concept:
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