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Consider the reaction of a generic metal ion (Mn+) with a generic porphine molecule (por): M(H2O)mn+(aq)+por(aq)⇌M(por)n+(aq)+mH2O(l)Based on the values of standard enthalpy, ΔH∘, and entropy, ΔS∘, shown here, ΔH -23.5 kJ ΔS 8.82 J/K what is the value of the formation constant, Kf , for the reaction at 25 ∘C?

Respuesta :

The value of the formation constant, Kf , for the reaction at 25 ∘C entropy is  37.976 x 103

ΔG = ΔH  - Δ(TS)

ΔH =  -23.5 x 103 J

ΔS  =  8.82 J/K

T  = 273 +25 = 298 K

ΔG= -23.5 x 103 - 298 (8.82)

ΔG= -  26.13 x 103 J or  - 26.13  kJ

ΔG= -RTlnK

ΔG = -  26.13 x 103 J

R = 8.314 J K-1 Mol-1

T = 298

-  26.13 x 103 J   =  - 8.314 x 298 ln

lnK = 10.54

K = 37.976 x 103

A state of disorder, randomness, or uncertainty is most frequently connected with the scientific notion of entropy, which is also a quantifiable physical attribute. The notion and the phrase are employed in a variety of disciplines, including classical thermodynamics, where they were initially identified, statistical physics, which describes nature at the molecular level, and information theory. It has numerous uses, including the transmission of information in information systems, cosmology, economics, sociology, weather science, and biological systems and their relationship to life. Scottish engineer and scientist William Rankine used the terms thermodynamic function and heat potential to refer to the thermodynamic notion in 1850.

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