Convert 12 g of oxygen gas into moles.
Gram molecular mass of O2 = 32 g
mass of oxygen gas given = 12 g
Therefore, 32 g of O2 = 1 mole of O2
So, 12 g of O2 = `12/32` moles of O2
Hence, 12 g of oxygen contains 0.375 moles of oxygen.
Concept: Molecular Mass
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