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Asked Dec 24, 2019
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A sample of pure copper has a mass of 12.5 g. Calculate the number of (a) moles in the sample and (b) copper atoms in the sample.

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Given Info: Mass of pure copper (m) is 12.5 g. The molar mass of copper ( Mcu) is 63.546 g/mol. Formula to calculate the number of moles in the sample is, т Mou Substitute 12.5 g for m and 63.546 g/mol for MCu to get n. 12.5g 63.546 g/mol = 0.197 mol Conclusion: The number of moles in the sample is 0.197 mol.

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