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The enthalpy of the reaction H(2)(g)+(...

The enthalpy of the reaction
`H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g)` is `DeltaH_(1)` and that of `H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l)` is `DeltaH_(2)`. Then

A

`DeltaH_(1) gt DeltaH_(2)`

B

`DeltaH_(1) = DeltaH_(2)`

C

`DeltaH_(1) lt DeltaH_(2)`

D

`DeltaH_(1)+DeltaH_(2)=0`

Text Solution

Verified by Experts

The correct Answer is:
A
Gaseous state is more energetic than liquid state, therefore `DeltaH_(1) lt DeltaH_(2)`
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H_(2)O(g)+(1)/(2)O_(2)(g)toH_(2)O(g)," "DeltaH=x H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l)," "DeltaH=y heat of vaporization of water is:

H_(2)(g)+(1)/(2)O_(2)(g)rarr2H_(2)O(l), DeltaH =- 286 kJ 2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l)……………kJ(+-?)

The enthalpy of vaporisation of liquid water using the data H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l) , DeltaH=-285.77 kJ//mol H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g) , DeltaH=-241.84 kJ//mol

DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
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  2. If DeltaH(f)(X), DeltaH(f)(Y), DeltaH(f)(R ) and DeltaH(f)(S) denote t...

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  3. The enthalpy of the reaction H(2)(g)+(1)/(2)O(2)(g)toH(2)O(g) is Del...

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  4. The enthalpy of the reaction : H(2)O(2)(l)toH(2)O(l)+(1)/(2)O(2)(g) ...

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  5. One mole of a gas absorbs 200 J of heat at constant volume. Its temper...

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  6. Work done on a system when one mole of an an ideal gas at 500 K is com...

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  7. For the reversible isothermal expansion of one mole of an ideal gas at...

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  8. The latent heat of vaporisation of water at 100 ^(@)C is 540 cal g^(-1...

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  9. Given that (1)/(2)S(8)(s)+6O(2)(g)to4SO(3)(g), DeltaH^(@)=-1590 kJ T...

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  10. For the process NH(3)(g) +HCI(g) rarr NH(4)CI(s)

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  11. The enthalpy change at 298 K of the reaction H(2)O(2)(l)toH(2)O(l)+1...

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  12. If S+O(2)toSO(2),DeltaH=-298.2 " kJ" " mole"^(-1) SO(2)+(1)/(2)O(2)t...

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  13. The entropy change for the fusion of 1 mol of a solid which melts at 2...

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  14. The heat change for the following reaction at 298 K and constant press...

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  15. Which of the following equations express DeltaH as heat of combustion ...

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  16. The enthalpy of formation of ammonia is -46.0 KJ mol^(-1) . The entha...

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  17. The heat evolved in combustion of benzene is given by the following eq...

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  18. DeltaG for a reaction at 300 K is -16 kcal and DeltaH is -10 kcal. The...

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  19. Enthalpy of neutralisation of NH(4)OH and HCl is numerically

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  20. The following are the heats of reactions - (i) Delta H(f)^(@) of H(2...

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