Physical Chem Notes-Practice 16

Physical Chem Notes-Practice 16 - Relationship between rG,...

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Relationship between Δ r Gº, Δ r G, Q, and K Fill in the blanks and boxes!! At constant P and T and w e =0, dG is a criterion of spontaneity and dG = ( Eqn 1 ) μ ii i N dn = 1 and for calculating Δ G or dG, we take G = . μ i N n = 1 Consider the balanced chemical reaction at some arbitrary composition a A + b B cC + dD initial # of moles n A n B n C n D infinitesimal change -dn A -dn B dn C dn D (if all dn i are positive) d ξ = dn a A = dn b B = dn c C = From Eqn 1 , initial G = G i = Final G = G f = μ A (n A -ad ξ ) + μ B (n B -bd ξ ) + μ C (n C +cd ξ ) + μ D (n D +dd ξ ) From the previous two equations dG = G f - G i = = d ξ (-a μ A -b μ B + c μ C + d μ D ) We can rewrite the equation above as Δ r G = ∂ξ G TP , = (-a μ A -b μ B + c μ C + d μ D ) = ( c μ
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