Apply the law of constant proportion to calculate the mass of oxygen that will be used up for combustion of 5g of h2 gas.
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In water H₂O – Hydrogen and Oxygen are present in 1: 8 ratios by mass. That means 1 gram of Hydrogen and 8 grams of oxygen required in forming 9 grams of water. Similarly for burning of 5 grams of Hydrogen – (5*8) = 40 grams of oxygen required.
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