2. kittens21 Couple of

3. meatballs121 dozen

4. pencils1441 gross of

5. stars 1 mole of602,200,000,000,000,000,000,000

10. 6.022 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 6.022 x 10 23

11. 6.022 x 10 23 = “Avogadro’s Number”. Amadeo Avogadro (1776-1855) I didn’t discover it. It’s just named after me!

12.  1 dozen kittens? (1 kitten weighs 3 lbs) 1 dozen 12 kittens 3 lbs 1 dozen1 kitten 36 lbs

13.  6 dozen meatballs? (1 meatball weighs 35 grams) 6 dozen 12 meatballs 35 grams 1 dozen1 meatball 2520 grams

14.  3 gross pencils? (1 pencil weighs 15 grams) 3 gross 144 pencils 15 grams 1 gross1 pencil 6480 grams

15. Depends... If it’s a mole of kittens, we take the mass of one kitten… and multiply by how many kittens. 3 lbs x 6.022 x 10 23 If it’s a mole of Carbon atoms, it’s easier than that! Carbon’s atomic mass = 12.0 grams/mole

16. Molar Mass = the mass (in grams) of 1 mole (6.022 x 10 23 ) of anything Finding the molar mass of an element is pretty easy! Take it’s atomic mass and make the units “X grams/1 mole of X atoms” Try it: Molar mass of Lithium? Helium? Iron? 6.94 grams/1 mole Li atoms 4.00 grams/1 mole He atoms 55.85 grams/1 mole Fe atoms

17. How many grams of lithium are in 3.50 moles of lithium? 3.50 mol Li = g Li 1 mol Li 6.94 g Li 24.29

18. How many moles of lithium are in 18.2 grams of lithium? 18.2 g Li = mol Li 6.94 g Li 1 mol Li 2.62

19. How many atoms of lithium are in 3.50 moles of lithium? 3.50 mol = atoms 1 mol 6.02 x 10 23 atoms 2.11 x 10 24

20. How many atoms of lithium are in 18.2 g of lithium? 18.2 g Li = atoms Li 1 mol Li 6.022 x 10 23 atoms Li 1.58 x 10 24 6.94 g Li1 mol Li (18.2)(6.022 x 10 23 )/6.94

21. If you had 107.92 grams of Aluminum foil, how many moles of Aluminum are there? = moles Al atoms

22. If you had 3.011 x 10 23 atoms of Calcium, how many grams of Calcium are there? = grams Ca

23. Since a compound is more than one atom bonded, just add the masses of all the atoms there 12.01 g + 2(16.00 g) = 44.01 g One mole of CO 2 ( 6.02 x 10 23 molecules ) has a mass of 44.01 grams Example: Carbon Dioxide (CO 2 )

24. 1 mole of NaCl would weigh exactly how many grams? = grams NaCl 6 moles of NaCl would weigh exactly how many grams? = grams NaCl

25. How many grams of Dihydrogen Monoxide are in 6.022 x 10 23 molecules of Dihydrogen Monoxide? = grams H 2 O

26. Equal volumes of all gases at the same temperature and pressure contain the same number of molecules. - Amedeo Avogadro Equal volumes of all gases at the same temperature and pressure contain the same number of molecules. - Amedeo Avogadro At STP (Standard Temperature and Pressure): Standard Temperature = 0˚ C Standard Pressure = 1 atmosphere 1 mole of a gas occupies 22.4 liters of volume At STP (Standard Temperature and Pressure): Standard Temperature = 0˚ C Standard Pressure = 1 atmosphere 1 mole of a gas occupies 22.4 liters of volume

27. How many moles of hydrogen are in 100 L of hydrogen at STP? 100 L = mol 22.4 L 1 mol 4.46

28. How many liters are occupied by 3 moles of oxygen gas at STP? 3 mol = L 1 mol 22.4 L 67.2

29. 16 moles of Cl 2 gas would occupy how many liters? = L Cl 2 = grams Cl 2 16 moles of Cl 2 gas would have a mass of how many grams?

30. 35 grams of carbon tetrafluoride gas would occupy how many liters? 1 mol CF 4 = L CF 4 1 mol 22.4 L 8.9 88.01 g 35 g

31. 1373 grams of N 2 gas would occupy how many liters? …………………………………………………..= L N 2

32. Mole Atoms or molecules Atoms or molecules Liters Grams 6.02 x 10 23 AtomicMassAtomicMass 22. 4 L 22.4 L