The data from a sedimentation equilibrium experiment performed at 293 K on a macromolecular solute in aqueous solution show that a graph of in c against (r/cm) 2 is a straight line with a slope of821. The rotation rate of the centrifuge was 1080 Hz. The specific volume of the solute is 7.2 x 10-4 m' kg-1. Calculate the molar mass of the solute.