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# Working With Moles

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### Working With Moles

1. 1. Working with moles
2. 2. Avagadro’s Number <ul><li>Avagadro’s Number is 6.02x10 23 </li></ul><ul><li>1 mol of Mg is 6.02x10 23 atoms of Mg </li></ul><ul><li>DO NOT confuse with molecules and representative particles!!! </li></ul>
3. 3. Particles and Molecules <ul><li>1 mol of N 2 is 6.02x10 23 molecules of N 2 </li></ul><ul><li>There are 2 N atoms in a molecule of N 2 </li></ul>
4. 4. Moles and Mass <ul><li>The molar mass of an atom is the atomic mass in grams. </li></ul><ul><li>The molar mass of a compound is the atomic mass in grams for all atoms. </li></ul><ul><li>LiOH, add the mass of Li+O+H. </li></ul>
5. 5. Molar Mass <ul><li>K 2 O </li></ul><ul><li>LiF </li></ul><ul><li>Al 2 S 3 </li></ul><ul><li>NH 4 + </li></ul>
6. 6. Calculations <ul><li>Given that 6.02x10 23 particles are in 1 mol. How many mol would you have in 1.25x10 24 ? </li></ul>
7. 7. Calculations <ul><li>Given that you have 5.0g of CH 4 , how many mol do you have? </li></ul><ul><li>Hint: what is the molar mass of CH 4 ? </li></ul>
8. 8. Calculations <ul><li>Given .7 mol of Li, how many grams? </li></ul><ul><li>How many atoms? </li></ul>
9. 9. Calculations <ul><li>Given 1.63x10 22 atoms of Na, how many grams? </li></ul><ul><li>How many moles? </li></ul>
10. 10. Converting Particles and Grams <ul><li>Given 75g of sodium, how many atoms do you have? </li></ul>
11. 11. Converting particles <ul><li>Given 143g of sodium iodide, how many particles do you have? </li></ul>
12. 12. Converting Particles <ul><li>If you have 5.02x10 21 particles of Al 2 O 3 , how many grams? </li></ul>
13. 13. Converting Particles <ul><li>If you have 3.6 mol of Silicon, how many atoms? </li></ul>
14. 14. Converting Particles <ul><li>Given 7.8x10 24 particles of Mg(OH) 2 , what is the mass? </li></ul>