Question

A doctor orders a blood sample from a child to test for traces of lead in the blood. Which of the following concentration

units would best meet this need?
O grams per liter
O molality
O percentage by mass
O parts per million

Answer 1

Answer:percentage by mass

Step-by-step explanation:

Answer 2

D. parts per million

Step-by-step explanation:

To find such small trace amounts in such a large volume as blood, you would need a smaller unit to identify the amount. ppm is the smallest unit option among the four.