C 6 H 6 freezes at 5 . 5 ° C . The temperature at which a solution of 10 g of C 4 H 10 in 200 g of C 6 H 6 freeze is _______ C ∘ . (nearest integer value), (The molal freezing point depression constant of C 6 H 6 is 5 . 12 ° C / m . )

Step-by-step solution

Pure Solvent: C 6 H 6 ℓ Given: T f ° = 5 . 5 ° C K f = 5 . 12 ° C / m :Solute is non dissociative ∵     Δ T f = k f × m ⇒ T f 0 - T f ' = 5 . 12 × 10 58 200 1000 kg mol ⇒ 5 . 5 - T f ' = 5 . 12 × 5 × 10 58 ⇒ T f ' = 1 . 086 ° C ≃ 1 C ∘