a). For the reaction
2A (8) + B (E) – 2D
AU' = - 10.5 KJ and AS* = -44.10 JK
Calculate AG for the reaction and predict, whether the reaction may
occur spontaneous
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Answer:
For the given reaction
2A
(g)
+B
(g)
⟶2D
(g)
Δn
g
=2−3=−1mole
Substituting the value of ΔU
θ
in the expansion of ΔH :
ΔH
θ
=ΔU
θ
+Δn
g
RT
=(−10.5kJ)+(+1)(8.314×10
−3
kJK
−1
)(298K)
=−10.5kJ−2.48kJ
=−12.98kJ
When we substitute the values of ΔH
θ
and ΔS
θ
in the expression of ∣deltaG
θ
then according to Gibbs' Helmholtz equation
ΔG
θ
=ΔH
θ
−TΔS
θ
=−12.98kJ−(298K)(−44.1JK
−1
)
=−12.98kJ−(13.14kJ)
ΔG
θ
=0.16kJ
Since ΔG
θ
for the reaction is positive , the reaction will not occur spontaneously .
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