Q$\mathrm{.}7.$ The intrinsic viscosities of solutions of polystyrene in toluene is $180c\frac{m^3}{a}m$ at $25C.$ Determine the molecular weight of this polymer. The mark$-$Houwink$-$S akurada constants for this system are.

$)=3\mathrm{.}60{10}^{-2}lg{m}^{-1}4a=(0\mathrm{.}64$

Q$.8$ A polymer with a weight average chain length of $200$ was found to have a melt viscosity of $100$ poise what is the viscosity of this polymex when the weight average chain length is $800?$