
(a)
Interpretation:
The milligrams of vitamin A that would be lethal to a 132 lb adult given that LD50 for vitamin A is 1510 mg/kg needs to be calculated.
Concept Introduction:
A lethal dose of a substance is given by LD50 which is the amount of substance that kills 50% of a target sample.
(a)

Answer to Problem 5E
90600 mg.
Explanation of Solution
Given:
LD50 for vitamin A = 1510 mg/kg
Weight of adult = 132 lb
Calculation:
Step 1: Convert 132 lb to kg
1 kg = 2.2 lb
Step 2: Calculate the mg of vitamin A
(b)
Interpretation:
The number of tablets each containing 0.40 mg of vitamin A that would be lethal to a 132 lb adult needs to be calculated.
Concept Introduction:
A lethal dose of a substance is given by LD50 which is the amount of substance that kills 50% of a target sample.
(b)

Answer to Problem 5E
Number of vitamin A tablets = 226,500
Explanation of Solution
Given:
Weight of adult = 132 lb
Amount of vitamin A per tablet = 0.40 mg
Calculation:
From part (a):
A lethal dose of vitamin A for an adult = 90600 mg
(c)
Interpretation:
The benefits of vitamin A need to be explained.
Concept Introduction: All the vitamin types are essential for human health, but there is a limit for each vitamin in our body. The deficiency and excess of all types of vitaminsare dangerous for health.
(c)

Explanation of Solution
Vitamin A is good for health as it protects the eyes from age-related effects or night blindness. It may also lower the risk of cancer. It supports a healthy immune system, promotes growth and healthy reproduction, and also strengthens bones.
Chapter U4 Solutions
Living By Chemistry: First Edition Textbook
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