When H2(g) and O2(g) react to form H2O(l), heat is released to the surroundings.Consider the reverse reaction, namely, the formation of H2(g) and O2(g) from H2O(l):2 H2O(l) S 2 H2(g) + O2(g). Is this reaction exothermic or endothermic? (Hint: Referto Figure 5.6.)

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