Question

how to find mass of aspirin if I used 0.2845g of the powder(crushed apririn) with 1mL of 6.0 mol/L of Nacl? Does the dilution(the above chemicals are diluted in a 500mL volumetric flask) matter ,and does adding the HCL/Fe^3+ stock solution in the end matter (1.00 mL of the the above diluted solution is put into a 10 mL volumetric flsk. Then, the rest is filled using HCL/Fe3+ stock solution which is made of 0.020 mol/L FeCl3 and 0.12 mol/ L KCL. If it's does, please help me calculate the mass percent and the of aspirin in the tablet.
(0.2845 g of aspirin tablet used ,and
0.3723 g of crushed aspirin tablet used)