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# The Mole

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### The Mole

1. 1. The Mole December 2nd, 2008
2. 2. Units <ul><ul><li>Units are fundamental to chemistry </li></ul></ul><ul><ul><ul><li>Important for interpreting information </li></ul></ul></ul><ul><ul><ul><ul><li>3 g vs 3 mL vs 3 g/mL </li></ul></ul></ul></ul><ul><ul><ul><ul><li>What can you determine from these units? </li></ul></ul></ul></ul><ul><ul><ul><li>Can be used to solve problems </li></ul></ul></ul><ul><ul><ul><ul><li>If you know what units you start with and you know what you end with you can use units to fill in the middle </li></ul></ul></ul></ul><ul><ul><ul><ul><li>This is called Dimensional Analysis </li></ul></ul></ul></ul>
3. 3. Dimensional Analysis     <ul><li>Allows for the conversion of quantity from one unit to another      </li></ul><ul><ul><li>  Simple </li></ul></ul><ul><ul><ul><li>g to mg </li></ul></ul></ul><ul><ul><li>Harder </li></ul></ul><ul><ul><ul><li>cubic feet to cubic inches </li></ul></ul></ul><ul><ul><li>Longer </li></ul></ul><ul><ul><ul><li>m/s to mi/hr </li></ul></ul></ul>
4. 4. But this isn't chemistry yet.... <ul><li>Exactly! Math is the fundamental language of science, if you can't communicate clearly with math you will have a difficult time understanding chemistry. Good communication skills: </li></ul><ul><ul><li>Identify important information </li></ul></ul><ul><ul><li>Write clear explanations </li></ul></ul><ul><ul><li>Check yourself for mistakes </li></ul></ul>
5. 5. The fundamental unit of Chemistry ... THE MOLE!! <ul><li>What is it?  A just a word that takes the place of a </li></ul><ul><li>number, just like we say a dozen instead of writing 12 or </li></ul><ul><li>a gross instead of 144. 1 mole = 6.022 x 10 23 You can have a mole of anything How many atoms would be in 6 moles? </li></ul><ul><li>How many molecules would be in 0.25 moles? </li></ul>
6. 6. How do Chemists use the mole? <ul><li>The mole allows us to think about quantities of elements in a size that is easy to picture on the human scale. A hydrogen atom weighs approximately 1.6726×10 − 27  kg </li></ul><ul><li>Can you picture how much that is? If a mole is 6.022 x 10 23 atoms.  How much does a mole of Hydrogen weigh?  Have you seen this number anywhere before? </li></ul>
7. 7. The Mole and the Periodic Table <ul><ul><li>The number under the atomic symbol is the mass of an element. </li></ul></ul><ul><ul><ul><li>Is this the mass of one atom of the element? </li></ul></ul></ul><ul><ul><li>This is the Molar Mass... the mass of one mole of an element </li></ul></ul><ul><ul><li>What is the molar mass of Oxygen? </li></ul></ul><ul><ul><li>What is the molar mass of Water? </li></ul></ul><ul><ul><li>What is the molar mass of Carbon Tetrachloride? </li></ul></ul><ul><ul><li>What is the molar mass of Magnesium Hydroxide? </li></ul></ul>
8. 8. The Mole and Dimensional Analysis <ul><ul><li>How can the mole be used in dimensional analysis? </li></ul></ul><ul><ul><ul><li>Converts between moles and atoms </li></ul></ul></ul><ul><ul><ul><li>Use molar mass to convert between g and mol </li></ul></ul></ul><ul><li>How many moles are in 20 g of Carbon? </li></ul><ul><li>How many moles are in 20g of Carbon Dioxide? </li></ul>