$3H_2(g)+O_3(g)cdots+cdots{H}_{2}O(g),DH(k\frac{J}{m}ol)$

$2H_2(g)+O_2(g)cdots-$cdots$2H_{2}O(g),-483\mathrm{.}6$

$3O_2(g)cdots-$cdots$2O_3(g),+285\mathrm{.}4$

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