Which formula must be molecular?

Question

Sone of the formulas below could be either empirical or molecular formulas; however, some of them can only be molecular formulas. Which below MUST be a molecular formula?

a) C4H9

b) C7H14O2

c) C2H6

d) C6H14O

Answer 1

The following must be molecular because they represent the simplest whole number ratio of the elements, i.e. you cannot divide by a number to get the subscripts to be smaller whole numbers.

a) C4H9

b) C7H14O2

d) C6H14O