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Molar volume (22.4 liter) of a gas at NTP contains Avogadro number of molecules.

22.4 liter or 22400 cm
³ of Nitrogen gas contains 6.023 × 10 ²³ molecules 
1 cm³ of Nitrogen gas contains 6.023 × 10 ²³ / 22400  molecules 

So, Number of nitrogen molecules present in 1 c.c. of gas at NTP is 2.67 × 10 ¹⁹
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