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General Chemistry I: 02 The Mole POGIL

Module by: Jason Ritchie. E-mail the author

Summary: General Chemistry I: 02 The Mole POGIL exercise

POGIL Exercise

The Mole

Model 1: The Mole, a way of counting numbers of atoms and molecules

1 dozen = 12 objects = 1.2 x 101 objects

1 mole = 602,200,000,000,000,000,000,000 objects = 6.022 x 1023 objects

Hydrogen has 1 protons and an average atomic mass of 1.008 amu or 1.008 grams / mol.

Carbon has 6 protons and an average atomic mass of 12.011 amu or 12.011 grams / mol.

Oxygen has 8 protons and an average atomic mass of 15.999 amu or 15.999 grams / mol.

Aluminum has 13 protons and an average atomic mass of 26.982 amu or 26.982 grams / mol.

Critical Thinking Questions:

  1. How many eggs are in one dozen eggs?
  2. How many oranges are in one dozen oranges?
  3. How does the identity of the object affect the number of items in dozen?
  4. How many eggs are in 2 dozen eggs?
  5. How many eggs are in 117.25 dozen eggs?
  6. If you had 154,589 individual eggs, how many dozen eggs would you have?

  1. Using a grammatically correct English sentence, describe how to convert any number of dozen objects to a number of individual objects (i.e. 117.25 dozen eggs to number of individual eggs).
  2. If a large egg weighs 2 ounces, what is the mass in grams of one dozen eggs?
  3. If a watermelon weighs 10 pounds, what is the mass in grams of one dozen watermelons?
  4. How does the mass of a dozen objects depend on the mass of the individual object?
  5. How many carbon atoms are in one mole of carbon?

  1. What is the mass, in grams, of one mole of carbon atoms?
  2. How many aluminum atoms are in one mole of aluminum?
  3. What is the mass, in grams, of one mole of aluminum?
  4. What is the mass, in grams, of 117.25 moles of aluminum?
  5. Using a grammatically correct English sentence, explain how to calculate the mass of a certain number of moles of a certain substance.

Model 2: Converting between Mass and Amount of Substance

Table 1
Chemical Formula Structure 3D structure
CH4methane    

Critical Thinking Questions:

  1. If a watermelon has 400 seeds in it, how many seeds would you find in one dozen watermelons? (express your answer in scientific notation)
  2. If a watermelon seed has a mass of 0.25 g, what is the mass of the seeds in one dozen watermelons?
  3. How many carbon atoms are in one methane (CH4) molecule?
  4. How many moles of carbon atoms are in one mole of methane (CH4) molecules?
  5. What is the mass, in grams, of the carbon atoms in one mole of methane (CH4) molecules?
  6. How many hydrogen atoms are in one methane (CH4) molecule?
  7. How many moles of hydrogen atoms are in one mole of methane (CH4) molecules?
  8. What is the mass, in grams, of the hydrogen atoms in one mole of methane (CH4) molecules?
  9. What is the total mass of one mole of methane molecules?
  10. If you had 117.25 grams of methane, how many moles of methane would you have?
  11. Convert the previous number of moles of methane to number of molecules of methane.
  12. Using a grammatically correct English sentence, explain how to convert grams of a substance into number of molecules of substance.

Exercises:

  1. What is the mass of 1.00 moles of Iron?
  2. What is the mass of 8.52 moles of Iron?
  3. How many atoms are in 5.66 g of Iron?
  4. How many water molecules (H2O
  5. ) are in 8.69 mg of water?

Challenge Problem:

  1. An aluminum sphere contains 6.23 x 1024 atoms. What is the radius of the sphere? (The density of aluminum is 2.70 g/cm3)

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