1 mole of H2O has Avogadro's number of O atoms (one per molecule).
1 mole of O2 gas has twice Avogadro's number of O atoms (two per molecule)
You need two moles of H2O to have as many O atoms as one mole of O2.
How many grams of water (H_2O}) have the same number of oxygen atoms as 1.0mol of oxygen gas?
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