ANSWERS: 1
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The formula translates to: 2 mols of H2 combines with 1 mol of O2 to produce 2 mols of H2O. So X moles H2 combines with X/2 of O2 to produce X mols of H2O. 6 mols of H2 produces 6 mols of H2O. The gram molecular weight of H2O is 18. So the answer is 6*18 (the last step is up to you!)
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