Which of the following has smallest number of molecules ?

Question

Which of the following has smallest number of molecules ? (A)  11.2 L of O2 at NTP  (B)  8.0 g of O2  (C)  0.1 mole of O2  (D)  2.24 × 104 mL of O2

Tardigrade Admin · Accepted Answer

(a) Number of molecules in 11.2 L of O2 (11.2/22.4)× 6.023× 1023 =0.5× NA (b) Number of molecules in 8.0 g of O2 =(8.0/32)×6.023×1023 =0.25× NA (c) Number of molecules in 0.1 mole of O2 =0.1× 6.023× 1023 =0.1× NA (d) Number of molecules in 2.24× 104 mL of O2 =(2.24× 104/22400) × 6.023× 1023 =NA Thus, 0.1 mole of O2 contains smallest number of molecules

Q. Which of the following has smallest number of molecules ?

$11.2 L$ of $O_{2}$ at $NTP$

$8.0 g$ of $O_{2}$

$0.1 m o l e$ of $O_{2}$

$2.24 \times 1 0^{4} m L$ of $O_{2}$

Q. Which of the following has smallest number of molecules ?

11.2L of O2​ at NTP

8.0g of O2​

0.1mole of O2​

2.24×104mL of O2​

$11.2 L$ of $O_{2}$ at $NTP$

$8.0 g$ of $O_{2}$

$0.1 m o l e$ of $O_{2}$

$2.24 \times 1 0^{4} m L$ of $O_{2}$