The average concentration of calcium in the human body is 15 mg/g of body mass. What is the mass of calcium in the body of a person weighing 150 lb? (1 lb = 454 g)
A)1.0 lb
B)0.023 lb
C)23 lb
D)100 lb
E)2.3 lb

Question

Quizplus · Accepted Answer

First, we need to convert the person's weight from pounds to grams:

150 lb = 150 x 454 g/lb = 68,100 g

Then, we can use the average concentration of calcium to calculate the mass of calcium:

15 mg/g x 68,100 g = 1,021,500 mg

Finally, we need to convert the mass of calcium back to pounds:

1,021,500 mg = 1,021,500/453.59 lb = 2.25 lb

Therefore, the mass of calcium in the body of a person weighing 150 lb is approximately 2.3 lb.

The best choice is E, which is the closest approximation to this value.

The Average Concentration of Calcium in the Human Body Is