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Combined Gas Law

Combined Gas Law. Combined Gas Law. Combines Boyle’s, Charles’s, and Lussac’s Laws. Shows the relationship between temperature, pressure, and volume if the amount of gas is held constant . P 1 and P 2 have to be in the same unit V 1 and V 2 have to be in the same unit

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Combined Gas Law

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  1. Combined Gas Law

  2. Combined Gas Law • Combines Boyle’s, Charles’s, and Lussac’s Laws. • Shows the relationship between temperature, pressure, and volume if the amount of gas is held constant. • P1 and P2 have to be in the same unit • V1 and V2 have to be in the same unit • Temperature has to be in Kelvin

  3. Temperature Scales • SI scale: degree Celsius (°C) or Kelvin (K) • English scale: degree Fahrenheit (°F) • °C + 273 = Temperature in Kelvin • Kelvin – 273 = temperature in °C • Kelvin scale is based off the Celsius scale. • At 0 K all matter is believed to stop moving • Absolute Zero

  4. P1 V1 P2 x V2 x = The combined gas law contains all the other gas laws! If the temperature remains constant. T1 T2 Boyle’s Law

  5. P1 V1 P2 x V2 x = The combined gas law contains all the other gas laws! If the pressure remains constant. T1 T2 Charles’ Law

  6. The combined gas law contains all the other gas laws! • If the volume remains constant. P1 V1 P2 x x V2 = T1 T2 Gay-Lussac Law

  7. Pratice • A He filled balloon at sea level has a volume of 2.1L at 0.998 atm and 36°C. If it released and rises to an elevation at which the pressure is 0.900 atm and the temperature is 28°C, what will be the new volume of the balloon? Answer: 1.81L

  8. Practice • At 0.00°C and 1.00 atm pressure, a sample of gas occupies 30.0 mL. If the temperature increased to 30.0°C and the entire gas sample is transferred to a 20.0 mL container, what will the gas pressure inside the container? Answer: 1.66 atm

  9. Practice • Air in a container occupies 145.7 mL at 1.08 atm. What volume must the container be to have a pressure of 1.43 atm? 110.04 mL Boyle’s

  10. Practice • A gas sample at 40.0°C occupies 2.32 L. If the temperature is raised to 75°C, what is the volume of the gas if pressure is constant? Answer: 4.35 L • A gas at 89°C occupies 0.67 L. If the volume is increased to 1.12 L, what the temperature be in degree Celsius? Answer: 148.77 °C Charles’

  11. Practice • A gas in a sealed container has a pressure of 123 kPa at 30.0°C. If the pressure is increased to 201 kPa, what is the new temperature? Answer: 49.02°C • The pressure in an automobile tire is 1.88 atm at 25°C. What will be the pressure if the temperature warms to 37°C? Answer: 2.78 atm Lussac’s

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