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Hydrogen and oxygen combine in the ratio...

Hydrogen and oxygen combine in the ratio of` 1 :8 `by mass to from water. What mass of oxygen gas would be required to react completely with 3g of hydrogen?

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During formation of water `(H_(2)O)` , 2 g of hydrogen gas reacts completely with 16 g of oxygen .
1 g of hydrogen gas will react completely with `(16)/(2)` g = 8 g of oxygen .
`therefore` 3 g of hydrogen gas will react completely with `8 xx 3 = 24` g of oxygen .
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