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The best vacuum so far attained in laboratory is $10^{10} m m$ of Hg. The number of molecules of gas remain per $c m^{3}$ at $20^{o} C$ in this vacuum is :
$3.29 \times 10^{4} m o l e c u l e s$
$2.5 \times 10^{9} m o l e c u l e s$
$3.29 \times 10^{5} m o l e c u l e s$
$3.29 \times 10^{7} m o l e c u l e s$

A

3.29 \times 10^{5} m o l e c u l e s

B

2.5 \times 10^{9} m o l e c u l e s

C

3.29 \times 10^{7} m o l e c u l e s

D

3.29 \times 10^{4} m o l e c u l e s

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