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If DeltaH(f)(X), DeltaH(f)(Y), DeltaH(f)...

If `DeltaH_(f)(X)`, `DeltaH_(f)(Y)`, `DeltaH_(f)(R )` and `DeltaH_(f)(S)` denote the enthalpies of formation of `X`, `Y`, `R` and `S` respectively, the enthalpy of the reaction `X+YtoR+S` is given by

A

`DeltaH_(f)(X)+DeltaH_(f)(Y)`

B

`DeltaH_(f)(R )+DeltaH_(f)(S)`

C

`DeltaH_(f)(X)+DeltaH_(f)(Y)-DeltaH_(f)(R )-DeltaH_(f)(S)`

D

`DeltaH_(f)(R )+DeltaH_(f)(S)-DeltaH_(f)(X)-DeltaH_(f)(Y)`

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaH=sum DeltaH_(f)(P)-DeltaH_(f)(R )`
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DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
  1. The work done by the system in a cyclic process involving one mole of ...

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  2. The work done by the system in the conversion of 1 mol of water at 100...

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  3. If DeltaH(f)(X), DeltaH(f)(Y), DeltaH(f)(R ) and DeltaH(f)(S) denote t...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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