Question

How many number of atoms are present in 50 grams of iron?

• A. $0.537\times {10}^{24}$
• B. $0.537\times {10}^{20}$
• C. $5.37\times {10}^{24}$
• D. $1.537\times {10}^{24}$

Answer 1

The correct option is A $0.537\times {10}^{24}$

Atomic mass of Fe = 56 gms
56 g of Fe contains $6.022\times {10}^{23}$ number of atoms
Thus, 50 g of Fe contains
$\frac{6.022\times {10}^{23}}{56}\times 50$ number of atoms
= $0.537\times {10}^{24}$