55. Solving a chemistry problem

5. The equivalent electrical conductivity of the HI solution at 18°C and infinite dilution is 381.5 Ohm–1 ∙ (mol − equiv)–1 ∙ cm2; the specific electrical conductivity of a 0.405 M solution is 0.1332 Ω–1 ∙ cm–1. Determine the concentration of H ions in solution