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Mass of one atom of an element is 6.645 × 10^-23 g. How many moles of element are there in 0.320 kg.

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Mass of one atom of an element is 6.645 × 10-23 g. How many moles of element are there in 0.320 kg.

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Mass of one atom of an element = 6.645 × 10-23 g 

∴ Mass of 1 mol of atom = 6.645 × 10-23 × 6.023 × 1023 = 40 g 

Number of moles =

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