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Hydrogen and oxygen combine in the ratio of 1 : 8 by mass to form water. What mass of oxygen gas would be required to react completely with 3g of hydrogen gas ?
Given that hydrogen and oxygen form water by combining in the ratio of 1:8 by mass . i.e., 1g of hydrogen gas is required for 8g for 8g of oxygen gas. 3g of hydrogen gas requires = 8×3 = 24g of oxygen gas.
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