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The concentration of Cu2+ ions in the water (which also contains sulfate ions) discharged from a certain industrial plant is determined by adding excess sodium sulfide (Na2S) solution to 0.400 L of the water. The molecular equation is Na2S(aq) + CuSO4(aq) → Na2SO4(aq) + CuS(s) Calculate the molar concentration of Cu2+ in the water sample if 0.0383 g of solid CuS is formed. Enter your answer in scientific notation.