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How many grams of urea [(NH2)2CO] must be added to 400 g of water to give...

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Chemistry

How many grams of urea [(NH2)2CO] must be added to 400 g ofwater to give a solution with a vapour pressure 2.50 mmHg less thanthat of pure water at 30°C? (The vapour pressure of water at 30°Cis 31.8 mmHg.)

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