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Difference between Internal Energy and Enthalpy

Heat of neutr...

Question

Heat of neutralisation of HF is

57.32KJ

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>57.32KJ

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<57.32KJ

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None of these

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Solution

The correct option is B >57.32KJ
Heat of neutralisation of HF is > 57.32 KJ as heat will be released in the ionisation of HF
$H F \to H^{P} + F^{-} Δ H$
$Δ H$ is - ve
$H^{P} + O H^{-} \to H_{2} O Δ H = - 57.32 K J$

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H F (a q) + N a O H \to N a F (a q) + H_{2} O (l) Δ H = - 68.6 k J / m o l

- 57.32 k J

H^{+} (a q) + {O H}^{-} (a q) \to H_{2} O

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