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Q.

The standard entropies of A2,B2 and  AB3 are 60, 40 and 50 JK-1 mol-1 respectively.  The following reaction would be an equilibrium reaction at the temperature …K

12A2+32B2AB3+30.0kJ

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a

1250 K

b

750 K

c

1000 K 

d

500 K

answer is B.

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Detailed Solution

At equilibrium 

ΔG=ΔH-TΔS=0  or  ΔH=TΔS

ΔH=-30.0kJ

ΔSr=SAB3-(12SA2+32SB2)=50-(12×60+32×40)

= 50 – (30 + 60) = -40 JK-1

T=ΔHΔS=3000040=750K

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The standard entropies of A2,B2 and  AB3 are 60, 40 and 50 JK-1 mol-1 respectively.  The following reaction would be an equilibrium reaction at the temperature …K12A2+32B2⇌AB3+30.0kJ