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  4. Find the approximate number of molecules in vessel of volume 7 litres at 0° C at 1.3× 105 pascals:

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Q. Find the approximate number of molecules in vessel of volume $7$ litres at $0^\circ C$ at $1.3\times 10^{5}$ pascals:

NTA AbhyasNTA Abhyas 2020

Solution:

$N=\frac{P V}{R T}\times N_{A}$
$=\frac{1 . 3 \times 10^{5} \times 7 \times 10^{- 3}}{8 . 314 \times 273}\times 6.023\times 10^{23}$
$=2.4\times 10^{23}$