For the reaction 2A(g)+B(g)rarr2D(g), DeltaU^theta=-10.5 kJ and DeltaS^theta=-44.1Jk^-1 Calculate DeltaG^theta for the reaction and predict whether the reaction may occur spontaneously.

For the reaction 2A(g)+B(g)rarr2D(g), DeltaU^theta=-10.5 kJ and DeltaS

1.	For the reaction 2A(g)+B(g)rarr2D(g), DeltaU^theta=-10.5 kJ and DeltaS^theta=-44.1Jk^-1 Calculate DeltaG^theta for the reaction and predict whether the reaction may occur spontaneously.
Answer» Solution :`Deltan` for the reaction=2-(2+1)=-1 `therefore DeltaH^theta=DeltaU^theta+DeltanRT=-10.5+(-1)xx8.314xx10^-3kJxx298=-12.98` DeltaG^theta=DeltaH^theta-TDeltaS=-12.98-298(-44.1xx10^-3kJk^-1)=+0.16kJ` Since `DeltaG^theta is POSITIVE, the reaction will not occur SPONTANEOUSLY at 298K.