Question

The empirical formula and molecular mass of a compound are CH2O and 180 g respectively. What will be the molecular formula of the compound?
(i) C9H18O9
(ii) CH2O
(iii) C6H12O6
(iv) C2H4O2

Answer 1

The empirical formula of the compound is CH2O, which has two numbers of atoms of hydrogen, and one atom of oxygen for each carbon.

Let’s find the mass: Molar mass of the carbon Carbon is 12

Molar mass of the hydrogen Hydrogen is 1

Molar mass of the oxygen Oxygen is 16

The mass of CH2O = 12+2*1+16 = 30.

The approximate molecular weight of the compound is 180.

So, the molecular formula of the given compound is C6H12O6.

Answer 2

C6H12O6. (Its a simple one mark question.)