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Hydrogen and oxygen combine in the ratio...

Hydrogen and oxygen combine in the ratio of 1.8 by mass to form water , What mass of oxygen as would be required to react completely with 3 g of hydrogen gas .

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It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8. Then the mass of oxygen gas required to react completely with lg of hydrogen gas is 8g. Therefore, the mass of oxygen gas required to react completely with 3 g of hydrogen gas is 8x3g=24 g.
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