2. NOTES: Gases, Molar Volume, & Stoichiometry – a REVIEW!

3. Avogadro’s Hypothesis: ● equal volumes of gases at the same temperature and pressure contain equal #’s of particles; ● at STP, 1 mol (6.02 x 10 23 ) of particles of any gas occupies a volume of 22.4 L.

4. Example #1: What volume does 0.742 mol of argon gas occupy at STP?

5. Example #1: What volume does 0.742 mol of argon gas occupy at STP?

6. Example #1: What volume does 0.742 mol of argon gas occupy at STP? = 16.6 L

7. Example #2: How many oxygen molecules are in 3.36 L of oxygen gas at STP?

8. Example #2: How many oxygen molecules are in 3.36 L of oxygen gas at STP?

9. Example #2: How many oxygen molecules are in 3.36 L of oxygen gas at STP? = 9.03 x 10 22 molecules

10. Example #3: Determine the volume (in L) occupied by 12.6 g of nitrogen gas, N 2, at STP.

11. Example #3: Determine the volume (in L) occupied by 12.6 g of nitrogen gas, N 2, at STP.

12. Example #3: Determine the volume (in L) occupied by 12.6 g of nitrogen gas, N 2, at STP. = 10.0 L N 2

13. Stoichiometry Example #1: Li 3 N (g) + 3H 2 O (l)  NH 3(g) + 3LiOH (aq) What mass of water is needed to react with 29.3 L of Li 3 N?

14. Stoichiometry Example #1: Li 3 N (g) + 3H 2 O (l)  NH 3(g) + 3LiOH (aq) What mass of water is needed to react with 29.3 L of Li 3 N?

15. Stoichiometry Example #1: Li 3 N (g) + 3H 2 O (l)  NH 3(g) + 3LiOH (aq) What mass of water is needed to react with 29.3 L of Li 3 N? = 70.6 g H 2 O

16. Stoichiometry Example #2: Li 3 N (g) + 3H 2 O (l)  NH 3(g) + 3LiOH (aq) When 13.3 L of NH 3 are produced how many formula units of LiOH are produced?

17. Stoichiometry Example #2: Li 3 N (g) + 3H 2 O (l)  NH 3(g) + 3LiOH (aq) When 13.3 L of NH 3 are produced how many formula units of LiOH are produced?

18. Stoichiometry Example #2: Li 3 N (g) + 3H 2 O (l)  NH 3(g) + 3LiOH (aq) When 13.3 L of NH 3 are produced how many formula units of LiOH are produced? = 1.07 x 10 23 formula units LiOH

19. Stoichiometry Example #3: Li 3 N (g) + 3H 2 O (l)  NH 3(g) + 3LiOH (aq) Given 112.5 grams of LiOH produced, what volume (L) of Li 3 N was used?

20. Stoichiometry Example #3: Li 3 N (g) + 3H 2 O (l)  NH 3(g) + 3LiOH (aq) Given 112.5 grams of LiOH produced, what volume (L) of Li 3 N was used?

21. Stoichiometry Example #3: Li 3 N (g) + 3H 2 O (l)  NH 3(g) + 3LiOH (aq) Given 112.5 grams of LiOH produced, what volume (L) of Li 3 N was used? = 35.1 L Li 3 N