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Understanding the Mole Concept: From Atoms to Dozens and Beyond

This discussion focuses on the concept of the mole, comparing it to familiar quantities like the dozen. The process of converting numbers into dozens and vice versa is outlined, emphasizing its application in counting atoms. The mole, defined as 6.02 x 10²³, provides a practical means to quantify atoms due to their minuscule size. We explore calculations involving moles, mass, and atomic quantities, illustrating how to use the periodic table for determining the mass of one mole of elements. Multiple examples and a worksheet quiz help reinforce the understanding of these concepts.

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Understanding the Mole Concept: From Atoms to Dozens and Beyond

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Presentation Transcript

  1. Discussion: The Mole Objective: To understand the mole concept and how it is related to the more familiar dozen.

  2. The Dozen • How do you convert a number like 54 to dozen? • we divide by 12 • How do we convert dozens to numbers? • Multiply by 12

  3. Counting atoms • How many atoms are there in a single molecule of

  4. The dozen is not used to measure atoms • Why would we not measure atoms in dozen? • They are to small • The quantity used to express how many in atoms is the mole. • It is equal to 6.02 x 1023

  5. 6.02 x 1023 • Which, if not written in scientific notation is • Mole = 602,000,000,000,000,000,000,000 • Dozen = 12 • Dozen = 1.2 x 101 • Mole = 6.02 x 1023

  6. How many BB are in 2.5 dozen? • If we wanted to find the number of baseballs in 2.5 dozen we would • multiply _____ by _____ = ______

  7. How many atoms are in 2.5 moles of sodium? • If we wanted to find the number of atoms of sodium in 2.5 moles we would • Multiply 2.5 by 6.02 x 1023 = 1.505 x 1024

  8. How many atoms are in 0.5 moles of calcium? • 0.5 x 6.02 x 1023 = 3.01x 1023 • Another way • 0.5 mol

  9. Convert 5.6 x 1023 molecules of oxygen to moles • 5.6 x 1023 molecules O2 • 5.6 x 1023

  10. How to find the mass of one mole of an element • To find the mass of one mole of sodium we look on the periodic table. • 1.00 mole Na = 23.0 grams • 4.2 moles • 4.2 x 23 = 96.6

  11. Calculate the formula mass of the compounds below • CuCO3 63.5 + 12 + (3 x 16) = 123.5 • Ba(NO3)2 = 137.3 + 2 x 14 + 6 x 16 = • Ca3(PO4)2 • Sodium chloride • Iron(III) oxide • Fe2O3 2 x 55.8 + 3 x 16 = 159.6

  12. Find the equality for the compounds below • 1.00 mole CuCO3 = 123.5g • 5.0 grams CuCO3 • 0.0404 moles CuCO3

  13. How to do the worksheet

  14. More Worksheet

  15. Quiz Ch 6 • This is on the Discussion the mole • Find this quiz please!

  16. Quiz • 1. How many grams in a mole of sodium? • 2. How many grams in a mole of sodium chloride? • 3. How many grams in a mole of oxygen? • 4. If you have 56 grams of carbon monoxide you have ______ moles • 5. how many atoms are in one mole?

  17. Quiz • 6. How many moles of oxygen atoms are in one mole of oxygen molecules? • 7. How many moles of hydrogen atoms are in two moles of C12H22O11 molecules? • 8. 2.5 moles of K2O = _____ grams. • 9. How many dozen eggs are in 2.4 x102 eggs? • 10. 3.01 x 1023 = _______ moles

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