The molecular mass of an organic compound is 78. Its empirical formula

1.	The molecular mass of an organic compound is 78. Its empirical formula is CH. The molecular formula is _______. (A) C2H4 (B) C2H2 (C) C6H6 (D) C4H4
Answer» Correct option: (C) C₆H₆ Empirical formula mass = CH = 12 + 1 = 13 Molecular mass = 78 r = \(\cfrac{Molecular\, mass}{Empirical\, mass}\) = \(\cfrac{78}{13}\) = 6 Molecular formula = r x Empirical formula = 6 x CH = C₆H₆

The molecular mass of an organic compound is 78. Its empirical formula is CH. The molecular formula is _______. (A) C2H4 (B) C2H2 (C) C6H6 (D) C4H4

Answer»

Correct option: (C) C₆H₆

Empirical formula mass = CH = 12 + 1 = 13

Molecular mass = 78

r = \(\cfrac{Molecular\, mass}{Empirical\, mass}\) = \(\cfrac{78}{13}\) = 6

Molecular formula = r x Empirical formula

= 6 x CH

= C₆H₆