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Moles!

Moles!. Review!. How many Hydrogen atoms are in 2.5 mols of Hydrogen? . Review. How many moles are in 2.5 x 10 5 atoms of magnesium, Mg. Molar Mass. Molar mass is the weight in grams of one mole for any element or compound .

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Moles!

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  1. Moles!

  2. Review! • How many Hydrogen atoms are in 2.5 mols of Hydrogen?

  3. Review • How many moles are in 2.5 x 105 atoms of magnesium, Mg

  4. Molar Mass • Molar mass is the weight in grams of one mole for any element or compound. • Hydrogen has the lowest possible molar mass of all elements because it has the smallest atomic mass. • Molar mass for elements is found by looking at the atomic mass on the Periodic Table. • The unit for molar mass is g/mol. • All elements have the same molar mass as the atomic mass EXCEPT the diatomic elements AND P4 and S8 (Does not apply in compounds)

  5. Molar Mass • For compounds-find molar mass by adding the masses of the individual elements. Ex. Molar mass of NaCl 22.99 + 35.45= 58.44 g/mol

  6. Molar Mass • What is the molar mass of CO? • What is the molar mass of KI?

  7. Molar Mass • If the compound formula has subscripts, multiply the mass of the element X the subscript. • Ex. Molar Mass of FeCl2 Fe= 55.85 Cl=35.45 x 2 = 70.90 55.85 + 70.90 = 126.75 = 126.8 g/mol • Ex. Zn(NO3)2 Zn = 65.39 N = 14.01x2 = 28.02 O = 16.00x6 = 96.00 65.39 + 28.02 + 96.00 = 189.41 =189.4g/mol

  8. Molar Mass • What is the molar mass of H2O? • What is the molar mass of CO2

  9. Mole Road Map

  10. Moles Problems Rules 1. ALWAYS put the GIVEN over 1 to start setting up  your problem. 2. When using the unit MOLECULES OR ATOMS always put “6.02 x 1023” in front of it in a conversion  factor. 3. When using the unit GRAMS always put the MOLAR  MASS in front of it in a conversion factor. 4. When using the unit MOLES always put 1 in front of  it in a conversion factor. 5.  ALWAYS use the units given to you [i.e., don’t change from atoms to molecules and vice versa] ALWAYS LABEL THE UNITS IN THE ENTIRE  PROBLEM!!!

  11. Practice! • Calculate the number of moles in 8200 g of Iron.

  12. Calculate the number of moles in 0.039 gramsof palladium

  13. Calculate the number of moles in 0.00655 grams of Antimony

  14. Calculate the mass in grams of 550 mols of Aluminum

  15. Calculate the number in grams of 7 mols of titanium

  16. Calculate the grams of 0.0086 mol of xenon

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