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Question

Arrange the molecules in the increasing order of molecular weight from top to bottom.
  1. CO
  2. CO2
  3. CaO
  4. CaCO3


Solution

The correct option is
Molecular weight is the sum of atomic weight of individual atoms constituting a molecule.

Molecular weight of CO = atomic weight of C + atomic weight of O = 12 + 16 = 28 u.

Molecular weight of CO2 = atomic weight of C + (2 × atomic weight of O) = 12 + 2 x 16 = 44 u.

Molecular weight of CaO = atomic weight of Ca + atomic weight of O = 40 + 16 = 56 u.

Molecular weight of CaCO3 = atomic weight of Ca + atomic weight of C + (3 × atomic weight of O) = 40 + 12 + 3 x 16 = 100 u.

Hence, the increasing order of molecular weight is
CO < CO2 < CaO < CaCO3

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