Multiple Choice
In water-treatment and food-safety settings, a chemical sanitizer concentration in dilute aqueous solution is most commonly expressed as which unit?
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14. Solutions
Parts per Million (ppm)
Multiple Choice
The average human body contains about 5,000 grams of blood. What mass of arsenic is present in the body if the amount in blood is 0.86 ppb?
A
5.8 × 1012 g
B
4.3 × 1012 g
C
4.3 × 10–6 g
D
5.8 × 10–6 g
Verified step by step guidance1
Understand the concept of parts per billion (ppb). It is a unit of measurement that represents the ratio of one part of a substance to one billion parts of the solution. In this case, 0.86 ppb means 0.86 grams of arsenic per 1 billion grams of blood.
Identify the total mass of blood in the human body, which is given as 5,000 grams.
Set up the proportion to find the mass of arsenic in the blood using the ppb value. The formula is: \( \text{mass of arsenic} = \frac{\text{ppb value} \times \text{total mass of blood}}{1,000,000,000} \).
Substitute the given values into the formula: \( \text{mass of arsenic} = \frac{0.86 \times 5,000}{1,000,000,000} \).
Perform the multiplication and division to find the mass of arsenic in grams. This will give you the mass of arsenic present in the body.
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