1. Sodium dodecyl sulfate is a detergent with a charged hydrophilic sulfate head group and a 12 carbon hydrocarbon tail.  In solid form it exists as a monomeric molecule but upon dissolving in water at room temperature (298 K) it assembles spontaneously (ΔG = -16.4 kJ/mol) into a higher ordered micelle with the structure shown below.

A. Measurements of this process at room temperature show an enthalpy of micelle formation (ΔH) of -1.42 kJ/mol.  Calculate the entropy for this reaction.  Is micelle formation accompanied by an increase or decrease in the disorder of the system?  Explain your answer.

B. Micelle formation is a good example of what type of noncovalent interaction?

C. Micelle formation in the presence of 0.5 M NaCl results in a more negative ΔH value of -8.49 kJ/mol with no further change in entropy compared to micelle formation in water.  Is micelle formation more energetically favored in water or 0.5 M NaCl?  What noncovalent interaction could account for this change in enthalpy?

Posted Date: 3/1/2013 6:06:51 AM | Location : United States

Ask an Expert

Related Discussions:- Calculate the entropy, Assignment Help, Ask Question on Calculate the entropy, Get Answer, Expert's Help, Calculate the entropy Discussions

Write discussion on Calculate the entropy
Your posts are moderated

Write your message here..

Related Questions

LED, not note

Radiation therapy-oxygen effect, Oxygen effect: The oxygen effect may p... Oxygen effect: The oxygen effect may play a role in the recurrence of cancer .The cell near the center of a large tumor have a poor blood supply and thus  a poor oxygen supply

What is the magnifying power of the microscope, Q. A compound microscope co... Q. A compound microscope consists of an objective lens of focal length 2.0cm and an eye piece of focal length 6.25cm separated by a distance of 15cm.How far from the objective sho

Direction of force , If conductors carries current in similar direction, th... If conductors carries current in similar direction, then force among them will be attractive. If conductor carries current in reverse direction, then force among them will be repul

Where is the magnetic field strongest in bar magnet, Where is the magnetic ... Where is the magnetic field because of a bar magnet strongest? Answer: This is just an experimental reality.

What is the measure of the force of gravity on an object, What is the measu... What is the measure of the force of gravity on an object? Force is the vector product of mass and acceleration: F = ma. Weight is a special case of that formula, where you subs

Define kepler''s laws, Johannes Kepler revealed three empirical laws by usi... Johannes Kepler revealed three empirical laws by using the data on planetary motion, pertaining to the orbit of planets. These laws are contained here because of the huge importanc

Derive lorentz transformation equations, (a) State the postulate of STR and... (a) State the postulate of STR and deduce Lorentz Transformation. OR Give basic postulate of special theory of relativity. Derive Lorentz Transformation equations. (b) Pro

Circuit theorems, The superposition theorem is a very useful network theore... The superposition theorem is a very useful network theorem. Write its statement

Explain reverse bias, Reverse Bias: When P-types material of a semi con... Reverse Bias: When P-types material of a semi conductor diode is linked a negative potential and the n-type material is linked at positive potential of a voltage source, the di