Dear ChE 530 students,

I updated the last page of 9.7 in the hwk solutions. If you've downloaded the solutions already, please obtain the new file for problems 5, 6, 7. The filename is the same and just that one page is different.

I finished grading all of the hw4 that I received. If you have a mailbox, it's in your mailbox.

A common flaw was applying a linear fit to data both within the linear region and beyond it in the nonlinear region. If a property is expected to change as

(function of property) = (const) + B c + (other) c^2 + ...

and the data are curved, then that is probably indicating that the c^2 term is beginning to play a role. Restrict your fit to the linear region only for determining a value of B.

The text was not very clear about the form of the [eta] equation to use for determining R_g. Buried in the chapter was an accurate value of a constant, Phi_0, which arises in an equation

[eta] = Phi_0 (< h^2 >_0 / M)^{3/2} M^1/2

See the solutions for the implementation and for incorporating alpha. Also see the solutions for the Flory-Krigbaum comparison.

If you have questions over the weekend, feel free to send me an email.

Prof. Greenfield

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