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The equation 2 H2 + O2 --> 2 H2O indicates that for every mole of water produced, 1 mole of hydrogen is needed. 1.8 grams of water is .0999 moles, and .0999 moles of hydrogen is .201 grams.

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Q: How many grams of hydrogen are needed to produce 1.80 g of water according to this equation 2H2 O2 2H2O?
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