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Calculate DeltaH(f)^(@) for Ubr(4) from ...

Calculate `DeltaH_(f)^(@)` for `Ubr_(4)` from the `DeltaG^(@)` of reaction and the `S^(@)` values at 298 K.
`U(s)+2Br_(2)(l)rarrUBr_(4)(s), DeltaG^(@)=-788.6 kJ. " "S^(@)(J//K-"mol")50.3, 152.3, 242.6`

A

`-822.1 kJ//mol`

B

`-841.2 kJ//mol`

C

`-775.6 kJ//mol`

D

`-804.3 kJ//mol`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaG=DeltaH-TDeltaS`
`DeltaS=242.6-50.3 -(2xx152.3), DeltaS=-112.3`
`DeltaG=-788.6xx1000=DeltaH+298xx112.3`
`DeltaH=-788.6 xx 1000 -298 xx 112.3`
`DeltaH=-822.1 " kJ mol"^(-1)`
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