MONDAy… 12-5-16 Today.. Finish Friday’s test on UNIT 7 Thermodynamics Get note sheet for Day one of Unit 8 Stoichiometry and complete it off of the weebly… do all math problems. Check point of HP tomorrow! HMWK: 1. Complete pg. 1 (1-10) and 1-5) and half of pg. 2 ( 6-10) of hmwk packet.

Tuesday… 12-6-16 Get out note guide from yesterday, reference table and calculator WE need to discuss something again!! We will start Unit 8 and then after new material.. You will have 30 minutes with HP group to do your check point HMWK: 1. Complete pg. 1 (1-10) and (1-5) and half of pg. 2 ( 6-10) of hmwk packet. 2. HP due this FRIDAY!!! 12/9/16

Unit 8 Stoichiometry

The Mole Mole (mol): SI unit for measuring the amount of a substance. Avogadro’s Number: 6.02 x 1023

The Mole - examples 1 mole of Helium = 6.02 x 1023 atoms 1 mole of Oxygen = 6.02 x 1023 molecules O2 1 mole of H2O = 6.02 x 1023 molecules H2O

Mole Conversions How many molecules are in 4 moles of H2 gas? 4moles x 6.02 x 1023 molecules _________________ = 1 mole 2.408 x 10 24 Molecules 5 x 1027 atoms = _______________ moles 5 x 10 27 atoms =x 1 mole = 8305 moles _________ 6.02 x 10 23 atoms

Mole Conversions cont. 9.2 moles F2 = _______________ molecules 9.2 moles F2 x 6.02 x 10 23 molecules _____________ 1 mole = 5.53 x 10 24 molecules How many atoms in the F2 molecules? 2 atoms in F2 x 5.53 x 10 24 molecules = 1.10 x 10 25 atoms ____________ 1 atom

Mole Conversions cont. 3.4 moles C2H4 = ________ atoms 3.4 moles C2H4 x 6.02 x 10 23 molecules x 6 atoms = 1.22 x 10 25 atoms 1 mole 1 molecule of C2H4

Mole Conversion practice cont. 0.45 mole He = ________atoms 2.7 x 10 23 atoms 2. 7.6 x 1023 molecules CH4 = ________moles 1.26 moles 3. 15 moles H2O = __________ atoms 2.7 x 10 25 atoms

Molar Mass Molar Mass: The mass of one mole of an element or compound. Molar mass of a compound = the sum of the masses of the atoms in the formula Use the atomic masses in grams on the periodic table.

Molar Mass The molar mass of water - H2O Mass of Hydrogen 2 x 1.008 = 2.016 Mass of Oxygen = 16.00 Molar mass of water 18.016 grams/mol

171.346 g Molar Mass Find the molar mass of the following: MgBr2 Mg (24.31) + Br X2 (79.90) = 184.11g Ba(OH)2 (Ba) + (O x2) +( Hx 2) 171.346 g

Molar Mass cont. Find the molar mass of the following compounds: Ba3(PO4)2 601.93 g C6H12O6 180.156g

Mole/Gram conversions Molar mass is grams per mol, so we can determine the number of grams in a given amount. To convert from Moles to grams, multiply the moles by the molar mass to get grams. Ex. .033 mol H2O = _______ g .033 mol x 18.016 g = 1 mol 0.594528 g

Mole/Gram Conversions Convert the following: How many grams are in 0.27 mol of Ba(OH)2 0.27moles x Ba ( OH) 2 weight = (171.346 g) _______________________ = 46.26 g 1 mole