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Question

Arrange the following in the increasing order of number of molecules.
  1. 50 cc of SO2 at S.T.P
  2. 100 cc of N2 at S.T.P
  3. 150 cc of O2 at S.T.P
  4. 200 cc of NH3 at S.T.P


Solution

The correct option is
1 litre = 1000 cm3 = 1000 cc
We know that, volume of 1 mole of gas at S.T.P = 22.4 L = 22400 cm3 = 22400 cc.
200 cc of NH3 at S.T.P contains (6.022×1023×200)22400=0.0537×1023 molecules
150 cc of O2 at S.T.P (6.022×1023×150)22400=0.0403×1023 molecules
100 cc of N2 at S.T.P
(6.022×1023×100)22400=0.0268×1023 molecules
50 cc of SO2 at S.T.P (6.022×1023×50)22400=0.013×1023 molecules.

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