Problem: The maximum concentration set by the U.S. Environmental Protection Agency for lead in drinking water is 15 ppb and for cadmium is 5.0 ppb. What are these concentrations in milligrams per liter? What are these concentrations in moles/L? Express your answers using two significant figures separated by a comma. 

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The maximum concentration set by the U.S. Environmental Protection Agency for lead in drinking water is 15 ppb and for cadmium is 5.0 ppb. What are these concentrations in milligrams per liter? What are these concentrations in moles/L? Express your answers using two significant figures separated by a comma. 

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