Chapter 5, Problem 5.113CP

TCDD, also called dioxin ${\text{(C}}_{\text{12}}{\text{H}}_{\text{4}}{\text{Cl}}_{\text{4}}{\text{O}}_{\text{2}}\text{, molar mass 322}\text{.0g/mol),}$ is a potent poison. The average lethal dose in humans is estimated to be $3.0\times {10}^{-2}$ mg per kg of body weight. (a) How many grams constitute a lethal dose for a 70.-kg individual? (b) How many molecules of TCDD does this correspond to?