Question

Carbon 40% hydrogen 6.66% and oxygen 53.34% if molecular mass is 90 than what will ne the molecular formula

Answer 1

Answer:

C3H6O3

Explanation:

Find the emperical formula first by dividing the percentage compositions by their atomic numbers and then you will obtain the moles. Divide the moles by the smallest to get the mole ratio which indicates the simplest formula.

Equate the simplest formula to the formula mass as seen to get the molecular formula.   (CH2O)n=90

                  12n+2n+16n=90

                   30n=90

                     n=3

The molecular formular is C3H6O3