Question

Which of the following has the smallest number of molecules?

• A. $0.1$ mole of $C{{O}_{2}}$ gas
• B. $11.2\,L$ of $C{{O}_{2}}$ gas at $STP$
• C. $22 \,g$ ot $C{{O}_{2}}$ gas
• D. $22.4\times {{10}^{3}}\,mL$ of $C{{O}_{2}}$ gas at $STP$

Answer 1

Answer: (A)

$0.1$ mole of $C{{O}_{2}}$ gas

Answer 2

(a) $0.1$ mole of $C O_{2}$
(b) $\frac{11.2}{22.4}=0.5$ mole of $C O_{2}$
(c) $\frac{22}{44}=0.5$ mole of $C O_{2}$
(d) $\frac{22.4 \times 10^{3}}{22400}=1$ mole of $C O_{2}$
Hence, the number of moles of $C O_{2}$ is least ie, $0.1$