Question

Calculate the number of atoms in 48 g of Mg.

• A. $12.04\times {10}^{23}$
• B. $6.02\times {10}^{23}$
• C. $18.06\times {10}^{23}$
• D. $24.08\times {10}^{23}$

Answer 1

Answer: (A)

$12.04\times {10}^{23}$

Atomic mass of magnessium ($Mg$) is $24$

Moles of $Mg=\frac{48}{24}=2$
Number of atoms of $Mg$ = Moles$\times$Avogadro number = $2\times 6.023\times {10}^{23}=12.04\times {10}^{23}$

Option $A$ is correct.