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Unit: Chemical Quantities

Learn to convert from particles to mass and back using molar mass, atoms, molecules, and formula units. Practice with examples for seamless understanding.

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Unit: Chemical Quantities

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  1. Unit: Chemical Quantities Two-step Conversions: Particles to Mass and Vice Versa

  2. After today, you will be able to… Perform two-step conversions using molar mass and representative particles (atoms, molecules, and formula units)

  3. We have already learned… How to convert moles into particles and vice versa by using the conversion factor… 1 mole = 6.02x1023 particles

  4. How to convert moles into grams and vice versa by using the conversion factor… 1 mole = atomic mass in grams

  5. These two conversion factors can now be combined… Particles  Moles  Grams Grams  Moles  Particles 6.02x1023 molar mass molar mass 6.02x1023

  6. Example: What is the mass of 1.79x1024 formula units of K3PO4? 3 K = 3(39.0983) = 1 P = 1(30.973762)= 4 O = 4(15.9994) = 117.2949 K: 1.79x1024 formula units K3PO4 30.973762 +63.9976 U: ? g K3PO4 212.26626 1.79x1024 f.u. K3PO4 1 mol K3PO4 . 212.26626 g K3PO4 x x = 6.02x1023 f.u. K3PO4 1 mol K3PO4 . 1 631 g K3PO4

  7. Example 2: How many atoms of Cu are present in 35.4 g of Cu? 35.4 g Cu 1 mol Cu 6.02 X 1023 atoms Cu 63.546 g Cu 1 mol Cu = 3.35 X 1023 atoms Cu

  8. HOMEWORK: Time to Practice!Complete WS 3

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