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How many moles of dioxygen are present i...

How many moles of dioxygen are present in 64g of dioxygen? (Molecular mass of dioxygen is 32)

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Number of moles =`"Mass"/"Molar mass"` Number of moles of dioxygen in 64 g of dioxygen = `(64g)/(32gmol^(-1))=2mol`
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