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Calculate standard entropy change in the...

Calculate standard entropy change in the reaction
`Fe_(2)O_(3)(s)+3H_(2)(g) rarr 2Fe(s)+3H_(2)O(l)`
Given `: S_(m_(0))(Fe_(2)O_(3).S)=87.4,S_(m)^(@)(Fe,S)=27.3`
`S_(m)^(@)(H_(2),g)=130.7,S_(m)^(@)(H_(2)O,l)=69.9JK^(-1)mol^(-1)`

A

`-212.5 JK^(-1)mol^(-1)`

B

`-215.2JK^(-1)mol^(-1)`

C

`-120.9JK^(-1)mol^(-1)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`Delta_(r )S^(@)=Sigmav_(p)S^(@)("products")-Sigmav_(R)S^(@)("Reactants")`
`=(2xx27.3 +3xx69.9)-(87.4+3xx130.7)`
`=-215.2 " JK"^(-1)" mol"^(-1)`
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