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CsOH +HCI rarr CsCI +H(2)O, DeltaH =- 13...

`CsOH +HCI rarr CsCI +H_(2)O, DeltaH =- 13.4 kcal mol^(-1)……….(i)`
`CsOH +HF rarr CsF +H_(2)O, DeltaH =- 16.4 kcal mol^(-1) ………(ii)`
Calculate `DeltaH` for the ionisation of `HF` in `H_(2)O`.

A

`3.0 kcal`

B

`-3.0 kcal`

C

`6.0 kcal`

D

`0.3 kcal`

Text Solution

Verified by Experts

i. `H^(o+) +overset(Theta)OH rarr H_(2)O DeltaH_(1) = - 13.4 kcal`
ii. `overset(Theta)OH +HF rarr H_(2)O +F^(Theta) DeltaH_(2) =- 1.6 kcal`
iii. `HF rarr H^(o+) +F^(Theta) DeltaH_(3) = ?`
`DeltaH_(3) = DeltaH_(2) - DeltaH_(1)`
`=- 16.4 - (-13.4) =- 3.0 kcal`
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Knowledge Check

  • If H_(2)S+3/2 O_(2) rarr H_(2)O+SO_(2) , DeltaH=-136.7 Kcal H_(2)+1/2 O_(2) rarr H_(2)O, DeltaH=-68.4 Kcal S+O_(2) rarr SO_(2), DeltaH=-71 Kcal What is DeltaH_(f) of H_(2)S

    A
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    B
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    C
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    D
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    B
    `-"281.1 kJ mol"^(-1)`
    C
    `"562.2 kJ mol"^(-1)`
    D
    `-"562.2 kJ mol"^(-1)`
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