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We got Moles! Mr. Bimber Freedom High School. Warm up questions 1. What is the smallest bit of an element? 2. What is the smallest bit of a compound?

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Presentation on theme: "We got Moles! Mr. Bimber Freedom High School. Warm up questions 1. What is the smallest bit of an element? 2. What is the smallest bit of a compound?"— Presentation transcript:

1 We got Moles! Mr. Bimber Freedom High School

2 Warm up questions 1. What is the smallest bit of an element? 2. What is the smallest bit of a compound? 3. Which heavy subatomic particles are in the nucleus? 4. What is average sum of the heavy particles called? 5. How many oxygen atoms are there in 2 molecules of Al(SO 4 ) 3 ? 1. Atom 2. Molecule 3. Protons and Neutrons 4. Atomic mass 5. 24 (2 X 4 X 3)

3 Moles can be fun!

4 Today you will learn: What a mole is. What a mole is. What a mole lets chemists do. What a mole lets chemists do. How to convert atoms and moles. How to convert atoms and moles. How to convert moles and grams. How to convert moles and grams. What else moles can convert. What else moles can convert. Why moles are so important to chemists. Why moles are so important to chemists.

5 The Big Picture A mole is a big number, A mole is a big number, just like a dozen is a number. But a mole is much bigger: But a mole is much bigger: 1 mole = 6.02 X 10 23 Moles let us count atoms. Moles let us count atoms.

6 This is important because: Moles let us change equations into units we can actually measure in the lab, like: Moles let us change equations into units we can actually measure in the lab, like: –Grams –Liters Moles are in the middle of almost all chemistry problems. Moles are in the middle of almost all chemistry problems.

7 What is a mole? A mole is just a really BIG number: A mole is just a really BIG number:602,000,000,000,000,000,000,000 This is sometimes called Avogadros Number. This is sometimes called Avogadros Number. How big is that? How big is that? –a mole of pennies in one stack would reach up past the moon! –to count up to one mole would take centuries. Moles let us count atoms. Moles let us count atoms. Moles change atoms to things we can measure. Moles change atoms to things we can measure.

8 Moles let us convert between: Grams Grams Liters of liquids Liters of liquids Liters of gas Liters of gas Atoms Atoms Molecules Molecules Ions Ions Subatomic particles Subatomic particles Moles are in the middle of all these conversions: Moles are in the middle of all these conversions:

9 Moles to Grams Atomic mass is the average number of protons and neutrons. Its also the number of grams in one mole of atoms. Atomic mass is the average number of protons and neutrons. Its also the number of grams in one mole of atoms. To change from moles to grams, multiply by atomic mass. To change from moles to grams, multiply by atomic mass. –One mole of carbon atoms weighs 12.01 grams. –3 moles of C atoms weighs (3X12.01)= 36.03 g. –5 moles of Mg weighs (5X24.3+= 121.5 grams.

10 Grams to moles To change grams to moles, divide by atomic mass. To change grams to moles, divide by atomic mass. –4 grams of Helium is (4/4) = 1 mole –20 g of He is (20/4) = 5 moles –50 g of Carbon is (50/12) = 4.17 moles

11 Other mole conversions One mole of any gas at standard temperature and pressure is 22.4 liters One mole of any gas at standard temperature and pressure is 22.4 liters One mole equals 6.02 X10 23 atoms, molecules or subatomic particles. One mole equals 6.02 X10 23 atoms, molecules or subatomic particles. One liter of any one molar solution has one mole of molecules dissolved in it. One liter of any one molar solution has one mole of molecules dissolved in it.

12 Why moles matter Moles let you change formulas and equations into units you can actually measure, like grams and liters. Moles let you change formulas and equations into units you can actually measure, like grams and liters. Moles let you count atoms, without actually counting them. Moles let you count atoms, without actually counting them.

13 Tips for the mole math ahead… Mole math is dimensional analysis. Mole math is dimensional analysis. Youll need to do math with exponents. Youll need to do math with exponents. Always write unit labels. Always write unit labels. A mole is just a number. A mole is just a number. 1 mole = Avogadros #. 1 mole = Avogadros #. Show your work. Show your work.

14 Summary 1 mole = 6.02 X 10 23 = Avogadros number 1 mole = 6.02 X 10 23 = Avogadros number Moles let you connect formulas and equations with measured units, like grams and liters. Moles let you connect formulas and equations with measured units, like grams and liters. To do Mole Math: To do Mole Math: –Write numbers and units –Use Dimensional Analysis

15 Get it? How much is 1 mole? How much is 1 mole? How do you change moles into grams? How do you change moles into grams? How do you change grams into moles? How do you change grams into moles? 6.02 X 10 23 6.02 X 10 23 Multiply by atomic mass. Multiply by atomic mass. Divide by atomic mass. Divide by atomic mass.


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