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Standard entropies of X(2), Y(2) and XY(...

Standard entropies of `X_(2), Y_(2) and XY_(3) are 60, 40 and 50 JK^(–1) mol^(–1)` respectively. For the reaction `(1)/(2)X_(2)+(3)/(2)Y_(2)hArr XY_(3)DeltaH=-30KJ `to be at equilibrium, the temperature should be:

A

500 K

B

750 K

C

1000 K

D

1250 K

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaS^(@)` reaction `=50 -(1)/(2)(60) -(3)/(2)(40) =-40JK^(-1)`
For reaction to be at equilibrium
`DeltaG =0`
`DeltaH-TDeltaS =0 implies T=(DeltaH)/(DeltaS) = (300000)/(40) = 750 K `
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