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How many grams of urea ((NH),CO) must be added to 447 g of water to give a solution with a vapor pressure 2.49 mmHg less

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How many grams of urea ((NH),CO) must be added to 447 g of water to give a solution with a vapor pressure 2.49 mmHg less than that of pure water at 30C? (The vapor pressure of water at 30C is 31.8 mmHg.) g

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