The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that may be discharged into the sewer system. Limits have been established for a variety of substances, including cadmium, which is limited to 5.0 g/L. If an industry is discharging cadmium as cadmium(II) phosphate (Cd₃(PO₄)₂), what is the maximum permissible molarity of that substance? Answer in the correct amount of significant figures.