Question

$5.6$ litres of a monoatomic gas at S.T.P contain :

• A. $6.02\times {10}^{23}$ atoms
• B. $\frac{1}{4}\times 6.02\times {10}^{23}$ atoms
• C. $\frac{1}{2}\times 6.02\times {10}^{23}$ atoms
• D. $\frac{1}{3}\times 6.02\times {10}^{23}$ molecules

Answer 1

Answer: (B)

$\frac{1}{4}\times 6.02\times {10}^{23}$ atoms

Sicne, $22.4$ litres of a gas at S.T.P contains $6.02\times {10}^{23}$ atoms.
$\therefore$ $5.6$ litres of a gas at S.T.P will contain $\frac{5.6}{22.4}\times 6.02\times {10}^{23}=\frac{1}{4}\times 6.02\times {10}^{23}$ atoms.