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OpenStudy (anonymous):

2H2O2 (l) → 2H2O(g) + O2(g) How many grams of hydrogen peroxide are needed to produce 90.0 g of water

OpenStudy (ipwnbunnies):

Convert mass of water into how many moles of water we have. Use stoichiometry comparison to figure out how many moles of H2O2 were needed. Multiply # of moles of H2O2 by its MM, found by doing some simple math from the periodic table.

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