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There are 0.0214 mol Cs in 1.29×10²² atoms Cs.

Use Avogadro’s number to convert atoms of Cs to moles of Cs.

Moles of Cs = 1.29×10²² atoms Cs × (1 mol Cs /6.022 × 10²³ atoms Cs) = 0.0214 mol Cs

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