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If S^@" for "H(2), Cl2 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) to 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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  20. The spontaneous nature of a reaction is impossible if

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