The standard heats of formation of H2O(g), H2S(g), H2Se(g), and H2Te(g) are , , , and

Chapter 24, Problem 22.97

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The standard heats of formation of H2O(g), H2S(g), H2Se(g), and H2Te(g) are , , , and , respectively. The enthalpies necessary to convert the elements in their standard states to one mole of gaseous atoms are 248, 277,227,and of atoms for O,S,Se,and Te,respectively. The enthalpy for dissociation of H2 is . Calculate the average , , , and bond enthalpies,and comment on their trend.

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