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# GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Solutions

Parts per Million (ppm) and Parts per Billion (ppb) are used to express extremely dilute solution concentrations.

## Parts per Million

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Parts per Million (ppm) Concept 1 1m
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Parts per Million (ppm) Example 1 1m
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Parts per Million (ppm) Concept 2 57s
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Parts per Million (ppm) Example 2 1m
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Problem

A 5.12 L sample of solution contains 0.230 g of potassium sulfate, K2SO4. Determine the concentration of K2SO4 in ppm if the density of the solution is 1.30 g/mL.

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Problem

Calculate the concentration in parts per billion of the following aqueous solution:0.91 mg of caffeine in a total volume of 131 mL.

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Problem

Glucose makes up about 0.102% by mass of human blood. Calculate this concentration in ppm.

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Problem

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?

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Problem

A water sample contains the pollutant chlorobenzene with a concentration of 16 ppm (by volume). What volume of this water contains 5.01×102 mL of chlorobenzene?