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Help with number 3 please!! 2. Calculate the mass percent of water contained in a sample of Na2B4O712H2O. 3. A 5.003g sample of Copper(II) nitrate

Help with number 3 please!!

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2. Calculate the mass percent of water contained in a sample of Na2B4O712H2O. 3. A 5.003g sample of Copper(II) nitrate hydrate is heated. After the water has been driven off, 2.99g of anydrous Copper(II) nitrate remains. Select the correct formula for the hydrate

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