Which one of the following pairs of gases contains the same numbe… - Vidyadip

MCQ

Which one of the following pairs of gases contains the same number of molecules

✓
$16\,g$ of ${O_2}$ and $14\, g$ of ${N_2}$
B
$8\, g$ of ${O_2}$and $22\,g $ of $C{O_2}$
C
$28\,g$ of ${N_2}$ and $22\,g$ of $C{O_2}$
D
$32\,g$ of ${O_2}$ and $32\,g$ of ${N_2}$

✓

Answer

Correct option: A.

$16\,g$ of ${O_2}$ and $14\, g$ of ${N_2}$

a
(a) $16\,g$ ${O_2}$ has no. of moles $ = \frac{{16}}{{32}} = \frac{1}{2}$

$14\,g$ ${N_2}$ has no. of moles $ = \frac{{14}}{{28}} = \frac{1}{2}$

No. of moles are same, so no. of molecules are same.

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