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# Mole calculations

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• 1. Using the mole for… CONVERSIONS
• 2. CONVERSIONS
• Must use the molar mass
• Can go from:
• # of atoms/molecules to moles
• Moles to # of atoms/molecules
• moles to grams
• grams to moles
• 3. SHORTCUTS for CONVERSIONS
• Moles to atom/molecules
• moles times 6.022 x 10 23
• Atom/molecules to moles
• # of atoms or molecules divided by 6.022 x 10 23
• Moles to grams
• moles times molar mass
• Grams to moles
• grams divided by molar mass
• 4. mole island atom island gram island liter island Divide by 22.4L Mult by 22.4L Divide by molar mass Mult by molar mass divide by 6.022 x 10 23 Mult by 6.022 x 10 23
• 5. Mole GRAMS LITERS # of atoms Divide by 6.022 x 10 23 X by 6.022 x 10 23 X by 22.4 liters Divide by 22.4 liters Divide by molar mass X by molar mass
• 6. Sample problems
• How many atoms of copper are found in 1.34 moles of copper?
• We are on mole island, need to get to atoms island.
• Multiply moles by 6.022 x 10 23
• 1.34 x 6.022 x 10 23 =
• 8.07 x 10 23 atoms of copper
• 7.
• How many moles does 1.23 x 10 23 molecules of CaCl 2 represent?
• we are on atom/molecule island, need to get to mole island.
• divide # of molecules by 6.022 x 10 23
• 1.23 x 10 23 / 6.022 x 10 23 =
• .20 moles of CaCl 2
• 8.
• How many grams are in 3.4 moles of I 2 ?
• We are on mole island, need to get to grams island.
• multiply # of moles by the molar mass
• 3.4 x 253.8 =
• 862.92 grams of I 2
• 9.
• How many moles does 134.7 grams of H 2 SO 4 equal?
• We are on gram island, need to get to mole island.
• divide # of grams by the molar mass
• 134.7 / 98.08 =
• 1.37 moles of H 2 SO 4
• 10.
• How much does 7.12 x 10 24 molecules of H 2 O weigh in grams?
• We are on atoms/molecules island, need to get to gram island.
• divide # of molecules by 6.022 x 10 23
• then multiply by the molar mass
• (7.12 x 10 24 /6.022 x 10 23 ) x 18.02 =
• 213.06 grams of water
• 11. HOMEWORK
• 1. How many moles are found in a sample containing 6.02 x 10 24 atoms?
• 2. If you have 1.28 x 10 22 molecules of HCl, how many moles do you have?
• 3. 3.5 moles of gold would have how many atoms?
• 4. If you had 12.3 moles of baking soda, how many molecules would it contain?
• 5. A sample of NaCl weighing 1.25 grams contains how many molecules?
• 12. MORE HOMEWORK
• 6. Calculate the number of moles in a 15.3 gram sample of barium hydroxide.
• 7. How many grams does 0.14 moles of silver nitrate equal?
• 8. If you had 2.3 grams of aluminum, how many atoms would it contain?
• 9. If you had 3.4 x 10 34 atoms of tungsten(V) arsenate, how many moles would you have? How many grams?