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From the following data at 25^(@)C {:(...

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:

A

`Delta_(r)H^(@)` for the reaction `H_(2)O(g) rarr 2H(g)+O(g)` is 925.5 kJ/mol

B

`Delta_(r)H^(@)` for the reaction `OH(g) rarr H(g)+O(g)` is 502 kJ/mol

C

Enthalpy of formation of `H(g)` is `-218` kJ/mol

D

Enthalpy of formation of `OH(g)` is `42` kJ/mol

Text Solution

Verified by Experts

The correct Answer is:
A, D
(A) `H_(2)O rarr 2H+O`
`DeltaH=925.5`
`B rarr 507.5`
`C rarr 432/2 =218`
`D rarr 42`
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From the following data at 25^(@)C {:(Reaction ,Delta_(r)H^(o)kJ//mol),((1)/(2)H_(2)(g)+(1)/(2)O_(2)(g)toOH(g),42),(H_(2)(g)+(1)/(2)O_(2)(g)to H_(2)O(g),-242),(H_(2)(g)to 2H(g),436),(O_(2)(g)to2O(g),495):} Which of the following Statement (s) is /are Correct: StatementA: Delta_(r)H^(@) "for the reaction" H_(2)O(g)to2H(g)+O(g)"is 925.5kJ/mol" Statement B: Delta_(r)H^(@) "for the reaction" H_(2)O(g)toH(g)+O(g)"is 423.5kJ/mol" 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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