The normal boiling point of ethanol should be estimated using thermodynamic data which then has to be identified that how well it agreed with the actual value. Concept introduction: The Gibbs free energy or the free energy change is a thermodynamic quantity represented by Δ r G ∘ . It is related to entropy and entropy by the following expression, Δ r G ∘ = Δ r H ∘ − T Δ r S ∘ Here, Δ r H ∘ is the change in enthalpy and Δ r S ∘ is the change in entropy. The value of Δ r G ∘ is zero at the boiling point of the liquid. Thus the entropy change can be written as, Δ r S ∘ = Δ r H ∘ T Thus, the temperature at which vaporization takes place can be calculated if Δ r H ∘ and Δ r S ∘ values are known.

BuyFind

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
BuyFind

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

Solutions

Chapter 18, Problem 44GQ
Interpretation Introduction

Interpretation:

The normal boiling point of ethanol should be estimated using thermodynamic data which then has to be identified that how well it agreed with the actual value.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ΔrG. It is related to entropy and entropy by the following expression,

ΔrG=ΔrHTΔrS

Here, ΔrH is the change in enthalpy and ΔrS is the change in entropy.

The value of ΔrG is zero at the boiling point of the liquid. Thus the entropy change can be written as,

ΔrS=ΔrHT

Thus, the temperature at which vaporization takes place can be calculated if ΔrH and ΔrS values are known.

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