Calculate the concentration of benzoyl peroxide required to prepare polystyrene with a number average molar mass of 750 kg/mol by bulk polymerization at 60°C. Assume: (i) the initiator is 60% efficient, (ii) the rate coefficients for initiator dissociation, propagation, and temrination are: 2x10-6s-1, 341 dm3mol-1s-1and 4x107dm3mol-1 s-1respectively, (iii) the density of styrene at the polymerization temperature is 0.88 g/cm3, and (iv) that termination by disproportionation, and chain tranfser to initiator and monomer, are negligible.