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Q.

For the reaction $2 H_{2} O_{(l)} \to H_{3} O_{(aq)}^{+} + {OH}_{(aq)}^{-},$ the value of $ΔH$ is

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a

114.6 KJ

b

-114.6 KJ

c

57.3 KJ

d

-57.3 KJ

answer is C.

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Detailed Solution

$H_{3} O_{(aq)}^{+} + {OH}_{(aq)}^{-} \to 2 H_{2} O_{(l)}; ∆_{n} H = - 57.3 kJ / mole$

$2 H_{2} O_{(l)} \to H_{3} O_{(aq)}^{+} + {OH}_{(aq)}^{-}; ∆_{r} H = 57.3 kJ$

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For the reaction 2H2O(l)→H3O(aq)++OH(aq)−,the value of ΔH is