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Hydrogen and oxygen combine to form wate...

Hydrogen and oxygen combine to form water vapour.
Calculate the ratio between the volume of hydrogen and volume of oxygen.

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`underset(40 L) underset("2 volumes") (2H_(2)(g))+ underset(20L) underset("1 volume")(O_(2)(g)) to 2H_(2)O(g)`
`2:1`
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