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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)rarr2Fe(s) +3H_(2)O(l)` Given : `S_(m)^(@) (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

`-212.5JK^(-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)`
`=-215.2JK^(-1)mol^(-1)`
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