1. Using the Ideal Gas Law In Chemical Reactions.
Gas Stoichiometry
Using the Ideal Gas Law
In Chemical Reactions.

2. The Automotive Airbag The airbag is responsible for
saving many thousands of lives
and represents an important
application of
Gas Stoichiometry.

3. The Automotive Airbag

4. The Automotive Airbag The idea of providing protection for
occupants of vehicles using some type
of cushioning device is not new.

5. The Automotive Airbag Today’s modern airbag systems
inflate in milliseconds
and have proven so effective
that they are now required
on all cars sold in the USA
and most other countries.

6. Most airbag systems use
technology first developed by Mercedes Benz which
uses a
chemical reaction to
produce a gas that inflates the bag.

8. The Automotive Airbag

9. Sodium azide (NaN3) decomposes rapidly into sodium metal and nitrogen gas.
NaN3(s)  Na(s) N2(g)

10. Sodium azide (NaN3) decomposes rapidly into sodium metal and nitrogen gas.
2 NaN3(s)  2 Na(s) N2(g)

14. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
2 NaN3(s)  2 Na(s) N2(g)

15. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
2 NaN3(s)  2 Na(s) N2(g)
? g L

16. 2 NaN3(s)  2 Na(s) + 3 N2(g) ? g 60. 0 L i
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
2 NaN3(s)  2 Na(s) N2(g)
? g L i

17. 2 NaN3(s)  2 Na(s) + 3 N2(g) ? g 60. 0 L i mol N2
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
2 NaN3(s)  2 Na(s) N2(g)
? g L i
mol N2

18. 2 NaN3(s)  2 Na(s) + 3 N2(g) ? g 60. 0 L i f mol N2
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
2 NaN3(s)  2 Na(s) N2(g)
? g L i
f mol N2

19. 2 NaN3(s)  2 Na(s) + 3 N2(g) ? g 60. 0 L i mol NaN3 f mol N2
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
2 NaN3(s)  2 Na(s) N2(g)
? g L i
mol NaN f mol N2

20. 2 NaN3(s)  2 Na(s) + 3 N2(g) ? g 60. 0 L h i mol NaN3 f mol N2
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
2 NaN3(s)  2 Na(s) N2(g)
? g L
h i
mol NaN f mol N2

21. 60.0 L N2 x ----------- x ----------- x ----------- = g NaN3
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
60.0 L N2 x x x =
g NaN3

22. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
mol N mol NaN g NaN3
60.0 L N2 x x x =
g NaN3

23. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
mol N mol NaN g NaN3
60.0 L N2 x x x =
L N mol N mol NaN3
g NaN3

24. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
mol N mol NaN g NaN3
60.0 L N2 x x x =
L N mol N mol NaN3
g NaN3

25. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
? L N mol N mol NaN3
g NaN3

26. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
L N mol N mol NaN3
g NaN3

27. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
L N mol N mol NaN3
g NaN3

28. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
L N mol N mol NaN3
g NaN3

29. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
L N mol N mol NaN3
g NaN3

30. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
L N mol N mol NaN3
g NaN3

31. Detemine the mass of sodium azide needed to produce 60
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at STP.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
L N mol N mol NaN3
116.1 g NaN3

32. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.

33. 60.0 L N2 x ----------- x ----------- x -------------- = g NaN3
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at oC and 758 mm Hg.
60.0 L N2 x x x =
g NaN3

34. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
mol N mol NaN g NaN3
60.0 L N2 x x x =
g NaN3

35. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
mol N mol NaN g NaN3
60.0 L N2 x x x =
L N mol N mol NaN3
g NaN3

36. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
22.4 L N mol N mol NaN3
g NaN3

37. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
NOT! L N mol N mol NaN3
g NaN3

38. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
1 mol N mol NaN g NaN3
60.0 L N2 x x x =
NOT! L N mol N mol NaN3
(at non-STP conditions)
g NaN3

39. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
? mol N mol NaN g NaN3
60.0 L N2 x x x =
in 60.0 L N mol N mol NaN3
g NaN3

40. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.

41. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
PV = nRT

42. PV = nRT n = ----------------
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at oC and 758 mm Hg.
PV = nRT
n =

43. PV = nRT PV n = ---------------- RT
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at oC and 758 mm Hg.
PV = nRT PV
n = RT

44. PV = nRT (758 mm)(60.0 L) n = ----------------------- RT
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at oC and 758 mm Hg.
PV = nRT
(758 mm)(60.0 L)
n = RT

45. PV = nRT (758 mm)(60.0 L) n = ----------------------- R (298 K)
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at oC and 758 mm Hg.
PV = nRT
(758 mm)(60.0 L)
n =
R (298 K)

46. n = -----------------------
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at oC and 758 mm Hg.
PV = nRT
(758 mm)(60.0 L)
n =
(62.4 mm L/mol)(298 K)

47. n = -----------------------
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at oC and 758 mm Hg.
PV = nRT
(758 mm)(60.0 L)
n =
(62.4 mm L/mol K) )(298 K)

48. n = -----------------------
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at oC and 758 mm Hg.
PV = nRT
(758 mm)(60.0 L)
n =
(62.4 mm L/mol K) )(298 K)

49. n = -----------------------
Detemine the mass of sodium azide needed to produce 60.0 L of N2 at oC and 758 mm Hg.
PV = nRT
(758 mm)(60.0 L)
n =
(62.4 mm L/mol K) )(298 K)

50. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
PV = nRT
n = mol

51. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
2 mol NaN g NaN3
2.45 mol N2 x x =
3 mol N mol NaN3
g NaN3

52. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
2 mol NaN g NaN3
2.45 mol N2 x x =
3 mol N mol NaN3
g NaN3

53. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
2 mol NaN g NaN3
2.45 mol N2 x x =
3 mol N mol NaN3
g NaN3

54. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
2 mol NaN g NaN3
2.45 mol N2 x x =
3 mol N mol NaN3
106.2 g NaN3

55. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
(758 mm) mol NaN g NaN3
60.0 L N2 x x x =
(62.4mm L/mol K) (298K) 3 mol N mol NaN3
g NaN3

56. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
(758 mm) mol NaN g NaN3
60.0 L N2 x x x =
(62.4mm L/mol K) (298K) 3 mol N mol NaN3
g NaN3

57. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
(758 mm) mol NaN g NaN3
60.0 L N2 x x x =
(62.4mm L/mol K) (298K) 3 mol N mol NaN3
g NaN3

58. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
(758 mm) mol NaN g NaN3
60.0 L N2 x x x =
(62.4mm L/mol K) (298K) mol N mol NaN3
g NaN3

59. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
(758 mm) mol NaN g NaN3
60.0 L N2 x x x =
(62.4mm L/mol K) (298K) mol N mol NaN3
g NaN3

60. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
(758 mm) mol NaN g NaN3
60.0 L N2 x x x =
(62.4mm L/mol K) (298K) mol N mol NaN3
g NaN3

61. Detemine the mass of sodium azide needed to produce 60.0 L of N2 at 25.0 oC and 758 mm Hg.
(758 mm) mol NaN g NaN3
60.0 L N2 x x x =
(62.4mm L/mol K) (298K) mol N mol NaN3
106.0 g NaN3