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A river's pollution level is measured at 80 ppm (parts per million). If the rive

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Question: A river\'s pollution level is measured at 80 ppm (parts per million). If the river has 2000 liters of water, how many grams of pollutants are present?

Options:

  1. 160 grams
  2. 180 grams
  3. 200 grams
  4. 220 grams

Correct Answer: 160 grams

Solution: 

80 ppm means 80 mg/L. 2000 L * 80 mg/L = 160000 mg = 160 grams

A river's pollution level is measured at 80 ppm (parts per million). If the rive

Practice Questions

Q1
A river's pollution level is measured at 80 ppm (parts per million). If the river has 2000 liters of water, how many grams of pollutants are present?
  1. 160 grams
  2. 180 grams
  3. 200 grams
  4. 220 grams

Questions & Step-by-Step Solutions

A river's pollution level is measured at 80 ppm (parts per million). If the river has 2000 liters of water, how many grams of pollutants are present?
  • Step 1: Understand what ppm means. 80 ppm means there are 80 milligrams of pollutants in every liter of water.
  • Step 2: Know the total volume of the river water, which is 2000 liters.
  • Step 3: Calculate the total amount of pollutants in milligrams by multiplying the concentration (80 mg/L) by the volume (2000 L).
  • Step 4: Perform the calculation: 2000 L * 80 mg/L = 160000 mg.
  • Step 5: Convert milligrams to grams. Since 1000 mg = 1 gram, divide 160000 mg by 1000.
  • Step 6: Perform the conversion: 160000 mg / 1000 = 160 grams.
  • Understanding ppm – Parts per million (ppm) is a way to express very dilute concentrations of substances. In this case, 80 ppm means 80 milligrams of pollutants per liter of water.
  • Volume to mass conversion – The question tests the ability to convert volume (liters) to mass (grams) using the concentration given in ppm.
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