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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

1000 K

B

1250 K

C

500 K

D

750 K

Text Solution

Verified by Experts

The correct Answer is:
D
`1/2 X_(2) + 3/2Y_(2) , XY_(3)`
`DeltaS = 50 -(1/2 xx 60 + 3/2 xx 40) = 50-90 = -40 kJ//mol`
`DeltaG = 0=-30 xx10^(3) - T xx (-40)`
`40 T = 30 xx 10^(3) rArr T = 750 K`
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