A sample weighing of .5375 g and containing Na2CO3 (106.0 g/mol),NaHCO3 (84.01 g/mol) as well as inert material dissolved and titrated with.1014 M HCL. The first end point volume phenolphthalein endpoint is 11.58 mL as well as the second end point volume (bromocresolgreen end point is 64.85mL. Compute the weight percentage of Na2CO3.