Question: an unknown sample containing compound x weighs 2000 g and...

An unknown sample, containing compound X, weighs 2.000 g and is dissolved in 0.01 M HCl and brought up to 100.0 mL volume. From that solution, 10.00 mL is removed and added to a 50.00 mL volumetric flask and the contents of the flask is diluted to volume with 0.01 M HCl. This second solution, the one in the 50.00 mL volumetric flask gives a response for compound X of 0.3148. Another 10.00 mL of the original solution is placed into another 50.00 mL volumetric flask. A standard solution of compound X has a concentration of 5.75 ppm and 10.00 mL of that standard solution is added to the same 50.00 mL flask. This flask is diluted to volume with 0.01 M HCl. This second flask has a response for Compound X of 0.6979. Find the %w/w (ie g/g x 100%) of compound X in the original unknown sample.