calculate the mass of oxygen that will be used up for combustion of 5g of H2 gas
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hydrogen under goes combustion to produce steam 2h₂+o₂⇒2h₂0 2Х2g 32g 2 x 18 4g of hydoger for combustion require oxyger=32g so 5 g of hydrogenwill require oxygen 34÷4×5 = 40 g
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