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Take your periodic table out

Take your periodic table out. What is atomic mass of Carbon Point where you can find it in the periodic table!. 6 is atomic number not atomic mass. Atomic mass= mass of 1 mol. Calculating Formula Mass /molecular weight.

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Take your periodic table out

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  1. Take your periodic table out

  2. What is atomic mass of CarbonPoint where you can find it in the periodic table! 6 is atomic number not atomic mass Atomic mass= mass of 1 mol

  3. Calculating Formula Mass /molecular weight Write down how you calculatethe formula mass of carbon dioxide, CO2. 12.01 g + 2(16.00 g) =  One mole of CO2 (6.02 x 1023 molecules) has a mass of 44.01 grams

  4. We use Unit factors = ratio of 1:1 to convert 1 mole= 6.022 X 10 ^ 23 atoms 1 mole= atomic mass if an atom( like C) Molecular weight if a molecule (CO2)

  5. Why are Ratio of 1 significant? 3.09X10^23 atoms= ?mol Math rule: If we multiply something on one side we have to do it on the other side Ratio of 1 so we don’t need to worry about that rule

  6. Calculations with Moles:Converting moles to grams How many grams of lithium are in 3.50 moles of lithium? 3.5moles-> ? g lithium 3.50 mol Li 6.94 g Li 24.3 = g Li 1 mol Li What unit factor are we using here? 1 mole= 6.94g Li

  7. Calculations with Moles:Using Avogadro’s Number How many atoms of lithium are in 3.50 moles of lithium? 6.02 x 1023atoms 3.50 mol 2.11 x 1024 = atoms 1 mol What unit factor are we using here? 1 mole= 6.022 X 10 ^ 23 atoms

  8. Calculations with Moles:Converting grams to moles How many moles of lithium are in 18.2 grams of lithium? 18.2 g Li 1 mol Li 2.62 = molLi 6.94 g Li What unit factor are we using here? 1 mole= 6.94g Li

  9. Calculations with Moles:Using Avogadro’s Number How many atoms of lithium are in 18.2 g of lithium? 18.2 g Li 6.022 x 1023 atoms Li 1 mol Li 6.94 g Li 1 mol Li 1.58 x 1024 (18.2)(6.022 x 1023)/6.94 = atoms Li What unit factors are we using here? 6.941 g 1 =mole 1 mole= 6.022 X 10 ^ 23 atoms

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