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If S^(@) for H(2),Cl(2) and HCl are 0.13...

If `S^(@)` for `H_(2),Cl_(2)` and HCl are 0.13, 0.22 and 0.19 KJ `K^(-1)mol^(-1)` respectively. The total change in standard entropy for the reaction
`H_(2)+Cl_(2)rarr 2HCl` is :-

A

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

B

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

C

`60JK^(-1)mol^(-1)`

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
`Delta S^(@)=Sigma (S^(@))_("products")-Sigma (S^(@))_("Reactant")`
`Delta S^(@)=2xx0.19-(0.13+0.22)`
`Delta S^(@)=0.03 kJ mol^(-1)K^(-1)=30 JK^(-1)mol^(-1)`
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ALLEN-THERMODYNAMICS -EXERCISE -2
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  4. Which has the least entropy :

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  5. When two gases are mixed the entropy :-

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  11. In a spontaneous irreversible process the total entropy of the system ...

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  13. Calculate the entropy of Br(2)(g) in the reaction H(2)(g)+Br(2)(g)rarr...

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  15. In which of the following cases entropy decreases?

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  16. Which of the following state function is not zero at standard state :-

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  17. Entropy change for an adiabatic reversible process is

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  20. The spontaneous nature of a reaction is impossible if :

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