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Volume of a gas at NTP is 1.12 × 10–7 cc. The number of molecules is thus equal to:
(a) 3.01 × 1012
(b) 3.01 × 1018
(c) 3.01 × 1024
(d) 3.01 × 1030
Ans - (a)
1 mole of gas occupies 22.4 litres at STP 1 mole of gas contains Avogadros number of molecules = 6.022*10^23. You have not given any units for the volume. The answer would be (volume/22.4)*Avogadros number = (1.12*10^-7/22.4)*6.022\*10^34 = 0.3011*10^27 if volume is in litres =0.3011*10^24 = 3.011*10^23 if volume is in m^3. Answer is c).
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