Boiling point of benzene is 353.23 K. When 1.8 g of non-volatile solute is dissolved in 90 g of benzene. Then boiling point is raised to 354.11 K. Given K_b (benzene) = 2.53 kg mol⁻1.The molecular mass of non- volatile substance is :
(a) 58 g mol⁻1
(c) 116 g mol⁻1
(b) 120 g mol⁻1
(d) 60 g mol⁻1