ANSWERS: 1
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2h2o2 -> 2h2o + o2 using n=m/M, where in is moles,m is mass and M is molecular weight. calculate n of h2o2, then n/2 to give n of o2 since 2mols of h2o2 give 1mols of o2. now use m = n x M to find the mass of oxygen.
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