Question

The number of aluminium ions present in 54 g of aluminium (atomic weight 27) is ___________.

• A. 2
• B. 18
• C. $1.1\times {10}^{24}$
• D. $1.2\times {10}^{24}$

Answer 1

Answer: (D)

$1.2\times {10}^{24}$

As per Mole concept,

$27g$ has $6.022\times {10}^{23}$ (Avogadro constant)

Hence $54g$ has $2\times 6.022\times {10}^{23}$ = $1.2\times {10}^{24}$