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Question

The number of molecules in 8 grams of oxygen gas is ______


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Solution

Molecularmassofoxygengas(O2)=32gramsNumberofmoleculesin32gramsofoxygengasis=6.022×1023moleculesNumberofmoleculesin8gramsofoxygengasis=832×6.022×1023=1.5×1023moleculesHencethecorrectanswertobefilledintheblankwillbe1.5×1023molecules


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