The intrinsic viscosity and the molar mass were determined by diffusion of natural light on $5$ fractions considered to be isomolecular of polystyrene in solution in butanone. The measurements are carried out at $25C.$

we give the value of $(\frac{C}{(I-I_0)}{)}_{,c}=0$ also de value of $P_d$ the slope at the origin of the angular dependence of $(\frac{C}{(I-I_0)}{)}_c=0.$

The slope at the origin has the expression $($ SEE PIC FOR THE EXPRESSION AND TABLE$)$

num of fraction $12345$

c$/$alpha$($I$-$Io$)=$o $2\mathrm{.}3062\mathrm{.}5053\mathrm{.}0934\mathrm{.}3447\mathrm{.}794$

pd $0\mathrm{.}6950\mathrm{.}6350\mathrm{.}5080\mathrm{.}3540\mathrm{.}188$

$[$n$]196\mathrm{.}3186\mathrm{.}8164\mathrm{.}6134\mathrm{.}495\mathrm{.}8$

$$Calculate the molar masses of the $$fractions$.$

Calculate the radius of gyration of the molecules.

$$Calculate the coefficients K and a of the Mark Houvink equation for PS in butanone.

$$Calculate the radii of gyration of molecules using the Flory Fox relation.

Compare with those obtained by light diffusion. What is the law of variation of the radius of turn with the molar mass?