Question

Hydrogen peroxide decomposes into water and oxygen. What amount of hydrogen peroxide is necessary to produce 1 kg of oxygen

Answer 1

Hydrogen peroxide is H2O2. First, convert the given amount (1kg O2) into moles. One mole of O2 is 2x16g = 32g. 1kg = 1000g. 1000/32 = 31.25, so we need 31.25 moles of O2. One mole of H2O2 contains one mole of O2, so we need 31.25 moles of H2O2 to produce 31.25 moles of O2. The problem asks for the "amount" of H2O2, which could be given in moles, but since O2 is given in kg I would convert the answer into kg. One mole of H2O2 is (2x1g)+(2x16g) = 34g, so 31.25 moles is 1062.5g or 1.0625kg.