The standard heats of formation of H2O1g2, H2S1g2,
Chapter , Problem 22.101(choose chapter or problem)
The standard heats of formation of H2O1g2, H2S1g2, H2Se1g2, and H2Te1g2 are -241.8, -20.17, +29.7, and +99.6 kJ> mol, respectively. The enthalpies necessary to convert the elements in their standard states to one mole of gaseous atoms are 248, 277, 227, and 197 kJ>mol of atoms for O, S, Se,and Te, respectively. The enthalpy for dissociation of H2 is 436 kJ>mol. Calculate the average HO, HS, HSe, and HTe bond enthalpies, and comment on their trend.
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