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Chemistry
A gas mixture contains O2 and N2 in the ratio of 1 : 4 by weight. The ratio of their number of molecules is
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Q. A gas mixture contains $O_2 $ and $N_2$ in the ratio of $1 \,:\, 4$ by weight. The ratio of their number of molecules is
JIPMER
JIPMER 2008
A
1 : 8
B
1 : 4
C
3 : 16
D
7 : 32
Solution:
As given, the ratio of moles of $O _{2}: N _{2}=\frac{1}{32}: \frac{4}{28}=\frac{1}{32}: \frac{1}{7}$
(As we know, mole $=\frac{ W }{ M }$ )
The ratio of number of molecules $=\frac{ N _{ A }}{32}: \frac{ N _{ A }}{7}=\frac{7}{32}: 1=7: 32$