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The enthalpy changes at 298 K in succes...

The enthalpy changes at 298 K in successive breaking of `O-H` bonds of water, are
`H_(2)O(g) rarr H(g)+OH(g),DeltaH=498kJ mol^(-1)`
`OH(g) rarr H(g)+O(g), DeltaH =428 kJ mol^(-1)`
The bond energy of the O-H bond is

A

`498 "KJ mol"^(-1)`

B

`428 "KJ mol"^(-1)`

C

`70 "KJ mol"^(-1)`

D

`463 "KJ mol"^(-1)`

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The correct Answer is:
D
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The enthalpy changes at 298 kJ in successive breaking of O-H bonds of water, are H_(2)O(g) rarr H(g)+OH(g),DeltaH=498kJ mol^(-1) OH(g) rarr H(g)+O(g), DeltaH =428 kJ mol^(-1) The bond energy of the O-H bond is

H_(2)O_((g)) rarr H_((g))+OH_((g))Delta H = x_(1) OH_((g)) rarr H_((g))+O_((g))Delta H = x_(2) Based on the these value, BE of O-H bond is

Dissociation of water takes place in two steps : H_(2)OrarrH+OH," "DeltaH=+497.8kJ OH rarr H+O," "DeltaH=428.5kJ Water is the bond energy of O-H bond ?

The bond dissociation energy of a diatomic molecule is also called bond energy. However, the bond dissociation energy depends upon the nature of bond and also the molecule in which the bond is present. The bond energy N-H bind in NH_(3) is equal to one-third of the energy of dissociation of NH_(3) because there are three N-H bonds and those of C-H bond in CH_(4) is equal to one-fourth of the energy of dissociation of CH_(4) Heat of a reaction = Bond energy of reactants - Bond energy of products The enthalpy changes for the reaction H_(2)O(g) rarr H(g)+OH(g) and OH (g) rarr O(g)+H(g) are 501.87 kJ mol^(-1) and 423.3 kJ mol^(-1) . The bond enthalpy of O-H bond is

H_(2)(g) +(1)/(2)O_(2)(g) rarr H_(2)O(g) DeltaH =- 242 kJ mol^(-1) Bond energy of H_(2) and O_(2) is 436 and 500 kJ mol^(-1) , respectively. What is bond energy of O-H bond?

H_(2)O(g) rarr H_(2)O(l), DeltaH =- 40.7 kJ DeltaH is the heat of……………….of water.

H_(2)O(l) rarr H_(2)O(g), DeltaH = +40.7 kJ DeltaH is the heat of ……………..of water.

ALLEN-THERMODYNAMICS -EXERCISE -3
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  2. Consider the reactions : C((s))+2H(2(g)) rarr CH(4(g)), DeltaH=-X kc...

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  3. The enthalpy changes at 298 K in successive breaking of O-H bonds of ...

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  4. If values of Delta(f)H^(Theta) of ICI(g),CI(g), and I(g) are, respecti...

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  5. Heat of dissociation of benzene to elements is 5535 KJ mol^(-1). The b...

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  6. The enthalpy change for the reaction 2C("graphite")+3H(2)(g)rarrC(2)H(...

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  7. Cl(2)(g)rarr2Cl(g), In this process value of Delta H will be -

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  8. The magnitude of heat of solution ….. On addition of solvent to soluti...

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  9. If H(2)(g)=2H(g),DeltaH=104cal , then heat of atomisation of hydrogen ...

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  10. The heat of combustion of yellow phoshphorus and red phosphorus are -9...

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  11. The enthalpy change for chemical reaction is denoted as DeltaH^(Theta)...

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  12. 2CO((g))+O(2(g))rarr 2CO(2(g))+X KJ In the above equation X KJ refers ...

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  13. Which of the following reactions represents Delta H (hydration) :-

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  14. Delta H for the reaction, I((g))+I((g))rarr I(2(g)) will be :-

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  15. Given that , A(s) rarr A(l)DeltaH=x A(l) rarr A(g), DeltaH=y The...

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  16. The enthalpy change of a reaction does not depend on

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  17. From the thermochemical reactions, C(graphite)+1//2O(2)rarr CO , Delta...

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  18. If H(2)+1//2O(2)rarr H(2)O , Delta =-68.39 Kcal K+H(2)O+ "water" rar...

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  19. Given C(s)+O(2)(g)rarr CO(2)(g)+94.2 Kcal H(2)(g)+2O(2)(g)rarr CO(2)...

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  20. From the following data, the heat of formation of Ca(OH)(2)(s) at 18^(...

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