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From the following data at 25^(@)C {:("Reaction ",Delta_(r) H^(@) kJ//mol),((1)/(2)H_(2)(g) + (1)/(2)O_(2)(g) rarr OH (g),42),(H_(2)(g) + (1)/(2)O_(2)(g) rarr H_(2)O_(g),-242),(H_(2)(g) rarr 2H(g),436),(O_(2)(g) rarr 2O(g),495):} Which of the following statement(s) is/are correct: Statement (a): Delta_(r)H^(@) for the reaction H_(2)O(g) rarr 2H(g) + O(g) Statement (b): Delta_(r)H^(@) for the reaction OH(g) rarr H(g) + O(g) is Statement (c) : Enthalpy of formation of H(g) is -218 kJ/mol Statement (d): Enthalpy of formation of OH(g) is 42 kJ/mol |
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Answer» Statement C `Delta H = 2 Delta H_(f_(H)) + Delta H_(f_(0)) - Delta H_(f_(H_(2)O))` `= 4.36 + (495)/(2) - (-242) = 925.5` (b) `Delta H rarr H + O` `Delta H = Delta H_(f_(H)) + Delta H_(f_(O)) - Delta H_(f_(OH))` `= (436)/(2) + (495)/(2) - 42= 423.5` (c ) `Delta H_(F) " of" H= (436)/(2) = 218` (d) `Delta H_(f)" of " OH = 42` |
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