Coolant used in car radiator is aqueous solution of ethylene glycol. In order to prevent the solution from freezing at − 0. 3 ∘ C . How much ethylene glycol must be added to 5 kg of water ? ( K f =

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Coolant used in car radiator is aqueous solution of ethylene glycol. In order to prevent the solution from freezing at − 0. 3 ∘ C . How much ethylene glycol must be added to 5 kg of water ? ( K f ​ = 1.86 K Kg mol − 1 )

TestHub · Accepted Answer

Δ T f ​ = 0. 3 ∘ C Δ T f ​ = M B ​ × W A ​ K f ​ × W B ​ × 1000 ​ 0.3 = 62 × 5000 1.86 × W B ​ × 1000 ​ ​ ∴ W B ​ = 50 g The amount used should be more than 50 g .

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