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![[Chemistry] For the balanced chemical reaction 2H2 + O2 → 2H2O If you have 18 molecules of H2, how](http://i.ytimg.com/vi/uMY1PRCmFJo/mqdefault.jpg "[Chemistry] For the balanced chemical reaction 2H2 + O2 → 2H2O If you have 18 molecules of H2, how")