Question

For determining the toxicity of different compounds, the concept of LD50, the lethal dose for 50% of test subjects is used. The LD50in rats for potassium cyanide is 1.52mg per 1 kg of body weight. Assuming the same LD50for humans, determine the molarity of potassium cyanide in a 355 mL (12 ounces) drink that would correlate to the LD50for a person having a mass of 170.0 lbs.

Answer 1

Step-by-step explanation:

LD 50 in rat = 1.52 mg per kg of body weight .

Body weight of man = 170 lbs = 170 / 2.2 kg = 77.27 kg

LD = 1.52 x 77.27 mg = 117.45 mg = .11745g

molecular weight of potassium cyanide = 65.12 g

moles of potassium cyanide = .11745 /65.12 = .0018 moles

.0018 in .355 L

molarity of solution = .0018 / .355 = .005 M .