Question

Determine the molecular formula of the compound with an empirical formula of CH and a molar mass of 78 g/mol.

Answer 1

Explanation:

->So, molecular formula = (CH)n = (CH)6 =C6H6; in this case we substituted the calculated value of n. ->Therefore, the molecular formula of the compound having the molecular weight 78 g/mol is (D) - C6H6. Hence option 'D' is the correct answer.

Answer 2

Empirical Formula = CH

Molar Mass = 78 g

Empirical Formula Molar Mass = (12+1) g

= 13 g

Molecular Formula = (CH)n

Value of n = Molar Mass/Empirical Formula Molar Mass

= 78/13

= 6

Hence, Molecular Formula = (CH)*6

= C₆H₆ (Benzene)

I hope this helps.