when we write a formula of a compound in its simplest form, it is empirical formula. Given the molecular formula is = C₁₈H₃₆ Now we can relate both empirical and molecular formula as; Molecular formula = n x empirical formula C₁₈H₃₆ = 18 x CH₂ So the empirical formula of C₁₈H₃₆ is CH₂
