Question

The empirical formula of a compound of molecular mass 120 is CH2O. The molecular formula of the compound is :

• A. C2H4O2
• B. C4H8O4
• C. C3H6O3
• D. All of these

Answer 1

Answer: (B)

C4H8O4

Answer 2

Emircal mass of CH2O = 12 + 2 + 16 = 30

$\mathrm { n } = \frac { \text { Molar mass } } { \text { Empirical mass } } = \frac { 120 } { 30 } = 4$

Hence : molecular formula = (CH2O) 4 = C4H8O4