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What is the mass of 5.30×1021 platinum atoms?
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What is the mass of 5.30×1021 platinum atoms?

User Bigmadwolf
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(5.08 * 10^21) / (6.022 * 10^23) = 0.0084357 moles * 195.084 g/mol = 1.65 g Atomic mass of platinum = 195.084 g/mol Avogadro's number = 6.022 * 10^23 so here you go
User Per Melin
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