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a) Calculate the number of atoms in a platinum ball with a mass of 72 mg . Express your answer in atoms to two significant

a) Calculate the number of atoms in a platinum ball with a mass of 72 mg .

Express your answer in atoms to two significant figures.

Calculate the amount (in moles) of each of the given substances.

b) 3.45 g Cu

Express your answer in atoms to two significant figures.

c) 26.0 g Os

Express your answer in atoms to two significant figures.

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