The Mole Triangle Mole  Gram Conversions Chemistry 3/12/14

Drill Leave your HW on the desk Take out a sheet of notebook paper. Chem Joke of the Day What does a monkey call barium with two sodium atoms? BaNaNa Drill Leave your HW on the desk Take out a sheet of notebook paper. You will go to the lab area—there are graduated cylinders that each contain ONE MOLE of a substance. Write down the formula for the substance, and calculate the mass of that ONE MOLE. HW: The Mole and Avogadro’s Number (back of WS)

Objectives IWBAT Calculate formula or molar mass. Use the mole triangle to convert from moles to grams, moles to particles, or moles to liters. NOTE: 10 pt QUIZ tomorrow, calculating formula AND molar mass (that’s it!)

HW Review Let’s put some problems on the board Moles and Mass Make sure to show all your work!

What is a mole? You and your row will get a baggie. Find the mass of the contents. Count the contents. Record your data on the data table on the board.

Item Number Mass (g)

Hmmm… What was the same? What was different? What do we call that number? Look back at the drill. Find the Cu and the Fe. What was the same? What was different?

The counting unit of Chemistry Mole The counting unit of Chemistry

What is a mole? A mole is a counting unit, like a dozen. 1 dozen eggs = 12 eggs 1 mole eggs = ? 6.022 x 1023 eggs! A mole is the same, no matter if it’s counting eggs or atoms. BUT it is SO large that the ONLY things we count with it are atoms and molecules!

Would you like a mole of $?? If I gave you one dollar a second, how long do you think it would take for me to give you a mole of dollars? (i.e. $6.022 x 1023) It would take over 19,100,000,000,000,000 years. The Earth was formed only 4,600,000,000 years ago! A mole of dollars (each .0043 in thick) would reach over 7000 light-years!

Calculate number of atoms in 2.5 mol Kr. One mole = 6.022 x 1023 atoms 2.5 moles = ? atoms 2.5 mol Kr x 6.022x1023 atoms Kr = 1.5 x 1024 atoms 1 mol Kr

Calculate number of moles for 1.9 x 1023 atoms of He. 6.02 x 1023 atoms = 1 mole 18.06 x 1023 atoms = ? moles 1.9 x 1023atoms He x 1 mol He = 0.32 mol He 6.02x1023 atoms He

Mole Triangle We can convert between Mol  g and back mol  particle and back mol  L and back Ms. Bloedorn will show you how! 

Practice Start The Mole and Avogadro’s Number WS

Exit Ticket How many bananas are in a mole of bananas? Convert 32 g O2 to grams