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The value of DeltaH(O-H) is 109 kcal mol...

The value of `DeltaH_(O-H)` is `109 kcal mol^(-1)`. Then formation of one mole of water in gaseous state from `H_(2)(g)` and `O_(2)(g)` is acccompained by

A

release of `218 kcal` of energy

B

release of `109 kcal` of energy

C

absorption of `218 kcal` of energy

D

Unpredictable

Text Solution

Verified by Experts

The correct Answer is:
A
In water `2(O-H)` bonds are formed
` :. DeltaH=-2xx109=-218 kcal`
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DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
  1. Which of the following value of DeltaH(f)^(@) represent that the produ...

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  2. The enthalpies of formation of N(2)O and NO are respectively 82 and 90...

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  3. The value of DeltaH(O-H) is 109 kcal mol^(-1). Then formation of one m...

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

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  5. For a system in equilibrium, DeltaG=0, under conditions of constant

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  6. In the reversible reaction of the type A+B hArr AB, in general.

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  7. Given C(s)+O(2)(g)toCO(2)(g), DeltaH=-395 kJ S(s)+O(2)(g)toSO(2)(g...

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  8. In an electrochemical cell, if E^(@) is the e.m.f. of the cell involvi...

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  9. If the enthalpy of vaporisation of water is 186.5 J mol^(-1), then ent...

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  10. The DeltaH value for reaction C+(1)/(2)O(2)toCO and CO+(1)/(2)O(2)to...

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  11. Given : C("diamond")+O(2)rarrCO(2),DeltaH=-395 kJ C("graphite"...

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  12. The law of Lavoisier and Laplace illustrates

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  13. For the reaction H(2)+I(2)hArr2NHI, DeltaH=12.40 kcal. The heat of f...

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  14. According to the reaction C(6)H(6)+15//2O(2)to3H(2)O+6CO(2) (Delta...

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  15. Thermodynamic equilibrium involves

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  16. In general, for exothermic reactions to be spontaneous

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  17. The heat of neutrasation of a strong acid and a strong alkali is 57.0K...

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  18. Which of the following is true for a reaction H(2)O(l)toH(2)O(g) at 10...

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  19. The free energy change DeltaG = 0, when

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  20. {:(Given :,C+2StoCS(2),DeltaH=117 kJ),(,C+O(2)toCO(2),DeltaH=-393 kJ),...

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