The gram molecule of benzene is equal to _______ g C6H6. (A) 70 (B)

1.	The gram molecule of benzene is equal to _______ g C6H6. (A) 70 (B) 72 (C) 10 (D) 78
Answer» Correct option: (D) 78 Molecular formula of benzene is C₆H₆. ∴ Molecular mass = sum of atomic weight of all the atoms ∴ Molecular mass = 12 x 6 + 6 x 1 = 72 + 6 = 78 ∴ According to Avogadro’s law, the gram molecule of benzene is equal to 78 g of C₆H₆.

The gram molecule of benzene is equal to _______ g C6H6. (A) 70 (B) 72 (C) 10 (D) 78

Answer»

Correct option: (D) 78

Molecular formula of benzene is C₆H₆.

∴ Molecular mass = sum of atomic weight of all the atoms

∴ Molecular mass = 12 x 6 + 6 x 1 = 72 + 6 = 78

∴ According to Avogadro’s law, the gram molecule of benzene is equal to 78 g of C₆H₆.