Arrange these molecules in order of decreasing mass: C6H14 , NO2 , Fe2O3 , and CaCO

The decreasing order of the mass of the molecules are:

Fe2O3>C6H14>CaCO>NO2

Explanation:

Let us calculate the atomic mass of the molecules given:

C6H14                                     Atomic mass of 1 carbon atom =12.01 amu

so, 6*12+1*14                                           Atomic mass of  hydrogen=1.007

= 86 g/mol

Atomic mass of NO2

  = 14+ (2*15.9)

   = 14+ 31.8

     = 45.8 g/mol

Atomic mass of Fe203

( 2*55.845)+ (3*15.9)

= 159.69 g/mol

Atomic mass of CaCO

40.07+12.0107+15.99

= 68.07g/mol

The decreasing order of the mass of the molecules are:

Fe2O3>C6H14>CaCO>NO2

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