Number of atoms question

i seem to have a problem with this question but I don’t know where, can someone solve and explain? thank youuu

For calculating the no. of molecules you can use the relation molecules=n*NA(Avogadro’s no.)

  1. for Br2=5/160* NA=0.03NA.
  2. for CH4= 2/16*NA=0.125NA.
  3. for SO3=1.12/22.4*NA=0.05NA.
    we don’t even need to solve any further it’s clear that: 1<3<2.
    Hope it helps:)
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