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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, 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

`-9.78JK^(-1)`mol^(-1)`

C

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

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
C
`(1)/(2)N_(2)+(3)/(2)H_(2)rarrNH_(3)`
`DeltaS^(@)=192.6-((1)/(2)xx191.5+(3)/(2)xx130.5)`
`=192.6-(95.75+195.75)`
`=192.6-291.5=-98.9JK^(-1)mol^(-1)`
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