Pure membranes of dipalmitoyl lecithin phospholipids are models of biological membranes. They melt = 41°C. Reversible melting experiments indicate that at Tm AHm=37.7 kJ mol-1. Calculate: A. The entropy of melting, ASm- B. The Gibbs free energy of melting, AGm- C. Does the membrane become more or less ordered upon melting? D. There are 32 rotatable CH2 CH2 bonds in each molecule that can rotate more freely if the membrane melts. What is the increase in multiplicity on melting a mole of bonds?

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Chapter15: Thermodynamics
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Pure membranes of dipalmitoyl lecithin phospholipids are models of biological membranes. They melt
= 41°C. Reversible melting experiments indicate that
at Tm
AHm=37.7 kJ mol-1. Calculate:
A. The entropy of melting, ASm-
B. The Gibbs free energy of melting, AGm-
C. Does the membrane become more or less ordered upon melting?
D. There are 32 rotatable CH2
CH2 bonds in each molecule that can rotate more freely if the
membrane melts. What is the increase in multiplicity on melting a mole of bonds?
Transcribed Image Text:Pure membranes of dipalmitoyl lecithin phospholipids are models of biological membranes. They melt = 41°C. Reversible melting experiments indicate that at Tm AHm=37.7 kJ mol-1. Calculate: A. The entropy of melting, ASm- B. The Gibbs free energy of melting, AGm- C. Does the membrane become more or less ordered upon melting? D. There are 32 rotatable CH2 CH2 bonds in each molecule that can rotate more freely if the membrane melts. What is the increase in multiplicity on melting a mole of bonds?
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