In black and white photography, excess AgBr(s) is removed by allowing it to react with Na2S2O3 to form the water-soluble complex [Ag(S2O3)2]3-. What is the molar solubility of AgBr in a solution with an equilibrium concentration of S2O32- being 0.438 M?
K for [Ag(S2O3)2]3- is 2.90 x 10^13 and Ksp for AgBr is 5.35 x 10^-13.
Express your answer in M using at least three significant figures. Do not use scientific notation.