Chemical Quantities Scientists are interested in determining how much product can be produced for a given amount of reactants.

How many grams of water are produced when 20.0 g of H reacts?

Determine how much of something by counting, measuring mass or volume. Use a unit called the mole to measure the amount of a substance.

Mole 6.02 x representative particles (atoms,molecules,formula units) Called Avogadro’s Number

Representative Particle Atom, molecule, formula unit, or ion Water— H 2 0 Molecule Chlorine— Cl 2 Molecule (diatomic) Sodium chloride— NaCI formula unit

How many moles in 2.41 x formula units of NaCI? 2.41 x fo.units 1 mole______ 6.O2 x fo.units = 4.00 moles

Practice How many moles in 9.03 x atoms Hg? 9.03x1O 24 atoms1 mole_____ 16.O2xlO 23 atoms = 15.0 moles

How many atoms in 4.50 moles Ca? 4.50 moles 6.02x10 23 atoms 1 1mole =2.709 x IO 24 atoms =2.71 x atoms

How many molecules in moles C0 2 ? moles 6.02x10 23 molecules 11 mole =6.020 x molecules

How many atoms in 1.00 mole sucrose (C 12 H 22 O 11 )? 1 molecule = atoms = 45 atoms 1.00 mol 6.02x1O 23 molecules 45atoms 1 I mole 1 molecule = 2.71 x atoms

How many atoms of C are in 2.0 mol C 12 H 22 O 11 ? 2.0mol 6.02x10 23 molecules 12atoms 11 mol 1 molecule = 1.4 x atoms C

How many atoms of H are in 2.00 mol C 12 H 22 O 11 ? 2.00 mol 6.02x1O23 molecules 22 atoms 1 1 mol 1 molecule =2.65 x atoms H

How many atoms of 0 are in 3.65 mol C 12 H 22 O 11 ? 3.65mol 6.02x 1O 23 moIecuIes 11atoms 11mol1 molecule =2.42 x atoms O

Gram Atomic Mass Called GAM Mass of one mole of an element Get GAM off periodic table C g O g Round to 1 Cu- 63.5g decimal place

Remember: I atom has a mass in amu C= 12.0 amu 0= 16.0 amu Cu= 63.5 amu The GAM of any element contains the same number of atoms- 1 mol or 6.02 x atoms

Find the mass of 1 mol of a compound Start with the formula Tells which atoms and how many

NH3 1molecule = 1 N atom 14.0 amu 3 H atoms 3(1.0) amu Imolecule NH 3 = 17.O amu

If you do the same thing using GAM - get gram molecular mass (gmm) 1 N atom14.Og 3 H atoms3(1.0) 3.0g 17.Og 1mole NH 3 = 17.Og and contains 6.02 x molecules of NH 3

Practice What is the mass of one mole of: CO 2 1 C atom12.0g 2 O atoms2(16.0)32.0g 44.0g

NaOH 1 Na atom23.0 g 1 O atom16.0 g 1 Hatom 1.0g 40.0g

Ba(N0 3 ) 2 1 Ba atom137.3 g 2 N atoms2(14.0) 28.0 g 6 O atoms6(16.0) 96.0 g g

For ionic compounds find Gram formula mass (gfm) NaCI 1 Na atom23.0 g 1 Cl atom35.5 g 58.5 g How many formula units are in 58.5g NaCI? 6.02 x formula units