Question

Mass of the one atom of the element X is $1.66\times {10}^{-26}$ g. Number of atoms in 1 g of the element is:

• A. $1.66\times {10}^{-26}$
• B. $1.66\times {10}^{25}$
• C. $1.66\times {10}^{-24}xNo$
• D. $6.024\times {10}^{25}$

Answer 1

Answer: (D)

$6.024\times {10}^{25}$

Mass of one atom = $1.66\times {10}^{-26}g$
$1.66\times {10}^{-26}gm\to 1atom$
$1gm\to \frac{1}{1.66\times {10}^{-26}}$ atom
$=6.024\times {10}^{25}atom$