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For the reaction X(2)Y(4)(l) to 2XY(g) a...

For the reaction `X_(2)Y_(4)(l) to 2XY(g)` at 300K the values of `DeltaU and DeltaS` are 2kcal and `20cal*K^(-1)` respectively. The value of `DeltaG` for the reaction is-

A

`-3400cal`

B

`3400cal`

C

`-2800cal`

D

2000 cal

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaH=DeltaU+Deltan_(g) RT or, DeltaH=2000+2xx2xx300`
`[because Deltan_(g)=2-0=2,R=2cal*K^(-1)*mol^(-1)]`
`therefore DeltaH=3200cal`
`DeltaG=DeltaH-TDeltaS=3200-(300xx20)=-2800cal`
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