"In aqueous solution, the concentration of the polymer has to be considered in the computation of the Gd. Hence, the Gd in aqueous solution is as follows; Gd=c/D(1/Mn-1/Mn0) where c is the fractional weight of carrageenan solution."

So how can I calculate the fractional weights of 1%, 2% and 4 % of xanthan solution?

Thanks in advance.