TODAY’S DO NOW 11/5/2014 The Krone family has 5 dozen bicycles. How many tires do they own? Show your work for this problem using dimensional analysis. What is the equivalence statement that you used to solve the problem above?

LIGHTING OF THE MOLYMPIC TORCH IS ON WEDNESDAY!

MOLYMPICS COMPETITION #1: VOLLEYBALL

The Krone family has 5 dozen bicycles. How many tires do they own? Show your work for this problem using dimensional analysis. What is the equivalence statement that you used to solve the problem above? WHAT IF WE MADE THIS A CHEMISTRY PROBLEM? moles H 2 O atoms of H

1. Write what you know or are given (including units). 2. Figure out what the question is asking you to calculate. 3. Use conversion factors to cancel out any “top” units with “bottom” units until you get to the desired unit. STEPS FOR MULTIPLE CONVERSIONS What happens when our mole equivalence statement is not enough?

Determine the number of chlorine ions in 4.32 moles of PCl 3. CLASS EXAMPLE #1 What’s wrong with this student’s answer?

Determine the number of chlorine ions in 4.32 moles of PCl 3. CLASS EXAMPLE #1 What’s wrong with this student’s answer?

The mass of all atoms within 1 mole of a compound Example: Gold (I) Oxide 2 Au: x 2 = amu 1 O: amu Total = amu MOLAR MASS

BY THE END OF THE CLASS PERIOD TODAY I WILL BE ABLE TO… understand the concept of molar mass and calculate molar mass

TODAY’S GAME PLAN Do Now 10 minutes Molar Mass 15 minutes Molympic Competition: Volleyball 10 minutes Exit Ticket, Assign Homework; Closing 10 minutes

THE MOST IMPORTANT PIECE OF INFORMATION!! 6.022x10 23 atoms = 1 mole = an element’s mass # in grams

MOLAR MASS The mass of 1 mole of a substance

MOLAR MASS OF AN ELEMENT… Found on the periodic table!! What is the molar mass of Barium?

MOLAR MASS OF A COMPOUND OR MOLECULE… Add up the molar masses of the elements that are in the compound or molecule Unit: g/mol

CO 2 C: 1 x = O: 2 x = g/mol Number of moles Element’s mass number Molar Mass of CO 2

ON YOUR WHITEBOARD/DESK… Solve for the molar mass of the following compounds Show your work on your whiteboard!!

IRON (III) CHLORIDE FeCl 3 Fe: 1 x = Cl: 3 x = g/mol

BARIUM HYDROXIDE Ba(OH) 2 Ba: 1 x = O: 2 x = H: 2 x = g/mol

TODAY’S GAME PLAN Do Now 10 minutes Molar Mass 15 minutes Molympic Competition: Volleyball 10 minutes Exit Ticket, Assign Homework; Closing 10 minutes

MOLYMPICS COMPETITION #1

MOLYMPICS VOLLEYBALL Expectations: 1.You will be working with a partner 2.One member of the team will work on a problem, then serve the paper over the ‘net’ 3.Speed and Accuracy…mostly Accuracy.

ANSWERS TO MOLYMPICS… 1. Ca(OH) 2 2. K 2 SO 4 3. SF 6 4. CaCl g/mol g/mol g/mol g/mol

BY THE END OF THE CLASS PERIOD TODAY I WILL BE ABLE TO… use the concepts of mole and molar mass to convert between grams and moles of a compound or molecule

TODAY MOST IMPORTANT PIECE OF INFORMATION!! 6.022x10 23 representative particles = 1 mole = molar mass # in grams

WHAT IS A REPRESENTATIVE PARTICLE?? The simplest unit of any substance There are x representative particles in a mole of any substance

WHAT IS A REPRESENTATIVE PARTICLE?? Elements = atom Ionic Compound = Formula unit Molecule (Covalently bonded)= Molecule

EXAMPLE #1… How many moles of iron (III) chloride exist in a g sample?

YOU TRY… How many moles of Ca(OH) 2 are in grams of Ca(OH) 2 ?

EXAMPLE #2… How many moles of copper(II)chloride are in 5.032x10 24 formula units of copper(II) chloride?

EXAMPLE #3… Convert 6.34 moles of potassium chloride to grams

YOU TRY… 1. How many moles of sulfur hexafluoride exist in a 8.29x10 23 molecule sample?

EXAMPLE #4… Convert 8.32 grams of carbon dioxide to molecules

TODAY’S GAME PLAN Do Now 10 minutes Mole Conversions using Molar Mass 20 minutes Molympic Competition: Volleyball part 2 15 minutes Exit Ticket, Assign Homework; Closing 10 minutes

TODAY’S GAME PLAN Do Now 10 minutes Mole Conversions using Molar Mass 20 minutes Molympic Competition: Volleyball part 2 15 minutes Exit Ticket, Assign Homework; Closing 10 minutes

HOMEWORK: Molar Mass Worksheet