Question

The empirical formula of a hydrocarbon is found to be CH. Labratory procedures have found that the molar names of the combine is 78 g/mol. What is the molecular formula of this compound?

Answer 1

Molecular Formula = C₆H₆

Step-by-step explanation:

Molecular formula is calculated by using following formula,

Molecular Formula = n × Empirical Formula ---- (1)

Also, n is given as,

n = Molecular Weight / Empirical Formula Weight

Molecular Weight = 78.0 g.mol⁻¹

Empirical Formula Weight = 12 (C) + 1 (H) = 13 g.mol⁻¹

So,

n = 78.0 g.mol⁻¹ ÷ 13 g.mol⁻¹

n = 6

Putting Empirical Formula and value of "n" in equation 1,

Molecular Formula = 6 × CH

Molecular Formula = C₆H₆