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Given that CH(4)(g) +360 kJ rarr C(g) ...

Given that
`CH_(4)(g) +360 kJ rarr C(g) +4H(g)`
`C_(2)H_(6)(g) +620 kJ rarr 2C(g) +6H(g)`
The value of `C-C` bond enegry is

A

`260 kJ mol^(-1)`

B

`180 kJ mol^(-1)`

C

`130 kJ mol^(-1)`

D

`80 kJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
From `1st` eqn. `DeltaH_(C-H)=(360)/(4)=90 kJ mol^(-1)`
From `2nd` eqn. `6DeltaH_(C-H)+DeltaH_(C-C)=620 kJ`
`DeltaH_(C-C)=620-6DeltaH_(C-H)`
`=620-6xx90=80 kJ mol^(-1)`
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DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
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  2. H(2)O(l)toH(2)O(g) , DeltaH=+43.7 kJ H(2)O(s)toH(2)O(l) , DeltaH=+6....

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  3. Given that CH(4)(g) +360 kJ rarr C(g) +4H(g) C(2)H(6)(g) +620 kJ r...

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  4. For a reaction Br(2)(l)+Cl(2)(g)to2BrCl at 300K the value of DeltaH=...

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  5. At what temperature, DeltaG of a reaction is equal to -5.2 kJ mol^(-1)...

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  6. For a reaction A(g)+3B(g)to2C(g) , DeltaH^(@)=-24kJ The value of D...

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  7. Consider the following reaction at equilibrium 2Fe^(2+)(aq)+Cu^(2+)to2...

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  8. A gas absorbs 400J of heat and expands by 2 xx 10^(-3) m^(3) against a...

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  9. The enthalpy of formation of ammonia is -46.0 kJ mol^(-1). The enthalp...

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  10. Which one of the following relations is incorrect ?

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  11. The work done by the system in a cyclic process involving one mole of ...

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

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

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

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

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

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

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

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

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

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