At very high temperature water vapour dissociates significantly:
$2H_2O(g)$ $2H_2(g)$ $+$ $O_2(g)$
If $n$ moles water are heated until $y$ moles $O_2$ have been produced, then the quantities at equilibrium are:
.......... mole(s) $H_2$
.......... mole(s) $H_2O$
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