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please explain An empty weigh boat had a mass of 0.3838 g. An unknown metal was placed in it and the total mass was 45.2191

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An empty weigh boat had a mass of 0.3838 g. An unknown metal was placed in it and the total mass was 45.2191 g. The metal was placed in a 50 mL graduated cylinder which originally had 25.00 mL of water. After the metal was added the volume was raised to 30.82 mL. Calculate the density of the unknown metal to the proper number of significant figures

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