Question

An organic compound contains H = 4.07%, Cl = 71.65% chlorine and remaining carbon. Its molar mass = 98.96. Find its molecular formula.

Answer 1

Empirical formula weight = 12 + (2 × 1) + 35.5

= 49.5

Molar mass = 98.96

n = `"Molar mass"/"Empirical formula mass"`

= `98.96/49.5`

= 2

∴ Molecular formula = 2 [CH₂Cl] = C₂H₄Cl₂