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A chemistry student adds a quantity of an unknown solid compound X to 650.mL of distilled water at 18 . C. After 10 minutes of

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A chemistry student adds a quantity of an unknown solid compound X to 650.mL of distilled water at 18 . C. After 10 minutes of strring, all of the X has dissolved. The student then drains off the solution and evaporates the water under vacuum. A precipitate is lef behind. The student washes, dries and weighs the precipitate. It weighs 18.9g

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