Use 500 mg/L as the concentration of each compound. a. methyl tertiary butyl ether (MTBE), \mathrm{C}_{5} \mathrm{H}_{12} \mathrm{O} \text { b. benzvlmorphine, } \mathrm{C}_{24} \mathrm{H}_{5} \mathrm{NO}_{3} \text { c. bepridil, } \mathrm{C}_{24} \mathrm{H}_{34} \mathrm{~N}_{2} \mathrm{O} \text { d. toluene, } \mathrm{H}_{5} \mathrm{C}_{6} \mathrm{H}_{2} \mathrm{C}-\mathrm{H}
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