1. The Gas Laws
Mathematical relationships between volume, temperature, pressure & amount of gas

2. Variables that Affect Behavior
Number of particles (n)
Pressure (P)
Volume (V)
Temperature (T)

3. Standard Temperature and Pressure STP
0oC or 273K
[Remember: K = oC + 273]
Standard Pressure
1 atm
760 mmHg
760 torr
101.3 kPa
STP

4. Boyles Law Constant Variables: Number of particles (amount)
Temperature
Formula: P1V1 = P2V2
Volume of gas is inversely proportional to the pressure
 V =  P

5. Boyles Law Graph

6. Boyle’s Practice P1V1 = P2V2
A gas occupies a volume of 259cm3 at 112 kPa. What volume will gas occupy at standard pressure?
V1 =
P1 =
V2 =
P2 =

7. Charles’ Law Constant Variables: Number of particles (amount) Pressure
Formula:
Volume of gas is proportional to temperature
 T =  V V1 T1 V2 T2 =

8. Charles’ Law Graph

9. Temperature MUST, MUST, MUST be in KELVIN
*VERY IMPORTANT*
Temperature MUST, MUST, MUST be in KELVIN

10. Charles Practice V1 T1 V2 T2 =
A gas occupies 907cm3 at 19.0oC. If the pressure remains constant what volume will the gas occupy at standard temperature?
V1 =
T1 =
V2 =
T2 =

11. Gay-Lussac’s Law Constant Variables: Number of particles (amount)
Volume
Formula:
Pressure is proportional to temp (K)
 P =  T P1 T1 P2 T2 =

12. Gay-Lussac’s Graph

13. Temperature MUST, MUST, MUST be in KELVIN
*VERY IMPORTANT*
Temperature MUST, MUST, MUST be in KELVIN

14. Gay-Lussac Practice P1 T1 P2 T2 =
A gas at 715mmHg has a temperature of 25.0oC. If the volume is held constant, what will the temperature of the gas be at standard pressure?
P1 =
T1 =
P2 =
T2 =

15. Combined Gas Law Combination of all three laws
Based on fact that gases generally undergo changes in T, V and P simultaneously
Formula:
Remember: Temp in Kelvin

16. Combined Practice P1 T1 P2 T2 V1 V2= V1 V2
A gas occupies 51.7mL at 27.0oC and 90.9 kPa. What volume will the gas occupy at STP?
V1 =
P1 =
T1 =
V2 =
P2 =
T2 =

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