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  3. you add 5.2 g iron to 20.40 ml of water and observ

You add 5.2 g iron to 20.40 mL of water and observe that the volume...

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You add 5.2 g iron to 20.40 mL of water and observe that the volume of iron and water together is 21.06 mL. Calculate the density of iron. Express your answer to two significant figures with the appropriate units.

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