5. Solving a chemistry problem

58. A sample weighing 0.5170 g containing barium thiocyanate was dissolved in a solution of sodium bicarbonate and 50.00 ml of a 0.1070 M iodine solution was added (feq = 1/2). After completion of the Ba(SCN)2+6I2+8H2O=BaSO4+2HCN+12HI+H2SO4 reaction, the solution was acidified and the excess iodine was titrated, using 16.30 ml of a 0.0965 M sodium thiosulfate solution. Calculate the mass fraction (%) of barium thiocyanate in the sample (M(Ba(SCN)2)=253.50 g/mol).