How many grams of methyl alcohol should be added to 10 litre tank of water to prevent its freezing at 268 K ? ( K f for water is 1.86 K kg mol − 1 )

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How many grams of methyl alcohol should be added to 10 litre tank of water to prevent its freezing at 268 K ? ( K f ​ for water is 1.86 K kg mol − 1 )

TestHub · Accepted Answer

Δ T f ​ = K f ​ m where m = molality 273 − 268 = 1.86 × M × V w ​ 5 = 1.86 × 32 × 10 w ​ w = 1.86 5 × 32 × 10 ​ = 860.2 ≈ 868.06 g

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