Platinum has a density of 21 gcm3. A platinum ring is placed in a graduated cylinder that contains water. The water level rises from 4.0 mL to 4.2 mL when the ring is added. What is the mass of the ri?

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Platinum has a density of 21 gcm3. A platinum ring is placed in a graduated cylinder that contains water. The water level rises from 4.0 mL to 4.2 mL when the ring is added. What is the mass of the ri?