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How many grams of sucrose (C12H22O11) must be added to 649 g of water to give...

How many grams of sucrose (C12H22O11) must be added to 649 g of water to give a solution with a vapor pressure 0.449 mmHg less than that of pure water at 20°C? (The vapor pressure of water at 20°C is 17.5 mmHg.)

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