Formula (Molar) Mass Li Mn K. Formula (Molar) Mass Add atomic mass of each atom in formula Unit: g/mol Mass of one mole of a pure substance.

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Presentation transcript:

Formula (Molar) Mass Li Mn K

Formula (Molar) Mass Add atomic mass of each atom in formula Unit: g/mol Mass of one mole of a pure substance

Formula (Molar) Mass NaCl Na 2 SO 4 (NH 4 ) 2 S

Grams to Moles to Particles Molar mass in grams =1 mole= x 10 23

Mole SI base unit Unit: mol Amount of a substance that contains as many particles as there are atoms in 12g of C. 1 mole = x particles

Mole Grams mol Na = ? g 3.5 mol NaOH = ? g 11.9 g Al = ? mol g Mg 3 (PO 4 ) 2 = ? mol Use Molar Mass to convert

Avogadro’s Number x Unit: atoms, formula units, molecules, ions Number of particles in 1 mol of substance

Mole Particles 2500 atoms Sn = ? mol 3.01 x molecules AgCl = ? mol 2.75 mol Al = ? atoms. Determine the number of molecules in 8.0 mol H 2 O.

Molar Mass Avogadro’s # Grams Mole Particles

1.20 x 10 8 atoms Cu = ? g 7.2 x molecules= ? g Ca(OH) 2. Determine the number of molecules of H 2 S in g.

Percent Composition 1.Find M.M. of elements 1.Find M.M. of compound 1.molar mass of element x 100 = % composition molar mass of compound

Percent Composition % of C in CO 2 % of H and O in H 2 SO 4 % of Na and S in Na 2 SO 4

Homework 1.Find the formula weight of NaCl. 2.Determine the number of moles of CO 2 in 454 grams. 3.Determine the mass in grams of 3.60 mol of H 2 SO 4. 4.Determine the mass in grams of 3.01 x atoms of H 2 O. 5.Find the % of Oxygen in Na 2 SO 4.

Practice 1. Find the Molar Mass of H 2 S. 2. Find the Molar Mass of Fe(NO 3 ) 2.

Practice 3. Determine the number of moles in 15 grams of OH. 4. Determine the number of grams in 8.42 x atoms of Br Determine the number of molecules in 6.75 moles of O Determine the number of atoms in 11.5 grams of N.

Practice 7. Determine the number of grams in 5 moles of S. 8. Determine the number of moles in 40.1 grams of H 2 O. 9. Determine the number of moles in 250 grams of NaCl. 10. Determine the number of grams in x molecules Li 2 O.

Practice 11. Find the % mass of H in NH Find the % mass of O in MgO.

Answers to Practice g/mol H 2 S g/mol Fe(NO 3 ) mol OH g Br x molecules O x atoms N g S mol H 2 O

Answers to Practice mol NaCl g Li 2 O % H % O