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.