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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)^(0) (Fe, s) = 27.3, S_(m)^(0) (H_(2)g) = 130.7, S_(m)^(0) (H_(2)O, 1) = 69.9 JK^(-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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