Arrange these molecules in order of decreasing mass: C 6 H 14 , NO 2 , Fe 2 O 3 , 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