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Beer–Lambert law

AP.Chem: SAP‑8 (EU), SAP‑8.C (LO), SAP‑8.C.1 (EK), SAP‑8.C.2 (EK)

Problem

A student is tasked with determining the number of moles of KMnOX4(aq)\ce{KMnO4}(aq) in a 150, point, start text, m, L, end text sample of an unknown solution. The student prepares a series of solutions with known concentrations of KMnOX4(aq)\ce{KMnO4}(aq) and measures the absorbance of each at an appropriate wavelength. These data are used to construct the calibration plot shown below.
If the absorbance of the unknown solution is 0, point, 50, how many moles of KMnOX4(aq)\ce{KMnO4}(aq) does the 150, point, start text, m, L, end text sample contain?
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