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Entry Task: Feb 4 th Monday

Entry Task: Feb 4 th Monday. WRITE THE QUESTION DOWN Entry Task Question: How many moles are there in 2000 grams of water (2 liters)? You have 5 minutes!. Agenda:. Discuss Mole Lab- Post Lab Mole Notes #3 particles to Moles to Grams H.W. Particles  Moles  Grams ws. I can….

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Entry Task: Feb 4 th Monday

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  1. Entry Task: Feb 4thMonday WRITE THE QUESTION DOWN Entry Task Question: How many moles are there in 2000 grams of water (2 liters)? You have 5 minutes!

  2. Agenda: • Discuss Mole Lab- Post Lab • Mole Notes #3 particles to Moles to Grams • H.W. ParticlesMolesGrams ws

  3. I can… • Calculate the molar mass of a compound. • Calculate particles moles  grams

  4. MOLE NOTES#3

  5. THE MOLE IS A BRIDGE BETWEEN THE MICROSCOPIC WORLD OF ATOMS AND THE MACROSCOPIC WORLD OF MATERIALS AND OBJECTS.

  6. When converting from super tiny (particles, ions, molecules, compounds) we use mole as a bridge to the large (grams, liters, etc) Particles  MOLE  Grams

  7. Microscopic World of Particles Atoms, Ions, Molecules, & Formula Units 1 mol = MW g MOLE BRIDGE Mass (grams) Macroscopic World of the Observable Grams, Liters, etc…

  8. Order of Operations-The SET Up • Starting amount • 2/3. Mole/particle conversion (1 mole = 6.02 x1023)small thing • 3/2. Gram/Mole conversion (1 mole = Molar mass (g))

  9. Practice: Particles to Grams

  10. The Set-up How many grams are in 2.74 x1022 formula units of LiCl? Hey- I need the molar mass! Mole/Gram conversion Place starting amount here - Its 42.39 g 2.74 x 1022f.u of LiCl 1 mole of LiCl 42.39 g of LiCl 6.02 x 1023f.uLiCl 1 mole of LiCl Place units across each other! Mole/Particle Conversion Place units across each other!

  11. The Clean up How many grams are in 2.74 x1022 formula units of LiCl? Cross out labels across from each other ------------ 2.74 x 1022 f.u of LiCl ------------ 1 mole of LiCl 42.39 g of LiCl ---------- ------------ 6.02 x 1023f.uLiCl 1 mole of LiCl (2.74)(42.394)/6.02 = 19.3 Now the exponents: then 1022 – 1023 = 10-1 = 19.3 x 10-1grams of LiCl = 1.93 grams of LiCl

  12. Particles to grams conversions How many grams are in 1.26 x 1023 molecules of nitrogen gas? N2 N= 14.0067 g X 2 = 28.0134 g 1 mole = 28.0134 grams Place starting amount here Mole/Gram conversion 1.26 x 1023molecules ofN2 ------------ ---------- 1 mole of N2 28.0134 g of N2 ---------- ------------ 6.02 x 1023 molecules N2 1 mole of N2 Mole/Particle Conversion (1.26)(28.0134)/6.02 = 5.86 then 1023 – 1023 = 100 = 5.86 grams of N2

  13. Particles to grams conversions How many grams are in a 4.39 x 1023 ions of Br-1? Br-1 Br-1= 79.904 g Place starting amount here Place conversion here ---------- 4.39 x 1023ions of Br ------------ 1 mole of Br 79.904 g of Br ---------- ------------ 6.02 x 1023ions Br 1 mole of Br (4.39)(79.904)/6.02 = 58.3 then 1023 – 1023 = 100 = 5.83 x 101 grams of Br

  14. Practice: Grams to particles

  15. The Set-up How many formula units are there in 45.0 grams of LiCl? Hey- I need the molar mass! Mole/Particle conversion Place starting amount here - Its 42.39 g 45.0 g of LiCl 1 mole of LiCl 6.02 x 1023f.uLiCl 1 mole of LiCl 42.39 g of LiCl Place units across each other! Mole/Gram Conversion Place units across each other!

  16. The Clean up How many formula units are there in 45.0 grams of LiCl? Cross out labels across from each other ------------ 45.0 g of LiCl ------------ 1 mole of LiCl 6.02 x 1023f.uLiCl 1 mole of LiCl ------------ 42.39 g of LiCl ------------ (45.0)(6.02)/42.39 = 6.39 = 6.39 x 1023 formula units of LiCl

  17. Particles to grams conversions How many molecules of nitrogen gas are there in 275 grams? N2 N= 14.0067 g X 2 = 28.0134 g 1 mole = 28.0134 grams Place starting amount here Mole/Particle conversion ---------- 275 grams of N2 ------------ 1 mole of N2 6.02 x 1023molecules N2 ---------- 28.0134 g of N2 ------------ 1 mole of N2 Mole/gram Conversion (275)(6.02)/28.0134 = 59.1 x 1023 molecules of N2 = 5.91 x 1024 molecules of N2

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