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please answer A chernistry student adds a quantity of an unknown solid cound X to 350 , mi, of distilled water at 20 . C.

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A chernistry student adds a quantity of an unknown solid cound X to 350 , mi, of distilled water at 20 . C. After 10 minutes of stirring, all of the X has dissolved. The student then drains off the solution and ev porates the water under vacuum. A precipitate is left behind. The student washes, dries and weighs the precipitate. It weighs 73.5g

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