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The standard entropies of N(2)(g),H(2)(g...

The standard entropies of `N_(2)(g),H_(2)(g)` and `NH_(3)(g)` are `191.5, 130.5,192.6JK^(-1)mol^(-1)` . The value of `DeltaS^(0)` during the formation of 1 mole of ammonia is

A

`-98.9JK^(-1)mol^(-1)`

B

zero

C

`+129.4JK^(-1)mol^(-1)`

D

`-29.4JK^(-1)mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
Formation of `NH_(3)` is
`(1)/(2) N_(2)+(3)/(2)H_(2)toNH_(3)`
`DeltaS^(@)=192.6-(1)/(2)(191.5)-(3)/(2)(130.5)`
`=-98.9 JK^(-1) mol^(-1)`
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DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
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  2. One moles of anhydrous AB dissolves in water and liberates 21.0 J mol^...

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  3. The standard entropies of N(2)(g),H(2)(g) and NH(3)(g) are 191.5, 130....

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  4. For hypothetical reversible reaction 1//2A(2)(g) +3//2B(2)(g) rarr A...

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  5. If DeltaH(f)^(@) of Icl(g), Cl(g) and I(g) is 17.57, 121.34 and 106.96...

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  6. If the enthalpy of combustion of C(graphite) is -393.3kJ mol^(-1), the...

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  7. An ideal gas expands from 10^(-3) m^(3) to 10^(-2) m^(3) at 300 K agai...

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  8. The equilibrium constant for certain reaction is 100. If the value R i...

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  9. Bond dissociation energy of O(2)(g) is x k J mol^(-1). This means that

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

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

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

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

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

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

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

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  18. Which one of the following relations is incorrect ?

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

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

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