Lesson: Combined Gas Law

​Match the units to their respective definitions:

1. P a. volume (mL, L, cm³)

2. T b. pressure (atm, kPa, torr, mmHg)

3. n c. moles (mol)​

4. V d. temperature (^oK, ^oC)​

​Once you've matched them, compare your answers to your partner. (30 seconds)

​Warm-up (3 minutes):

​

​P₁V₁T₂=P₂V₂T₁

Multiple Choice

What law combines all 3 factors (pressure, temperature, and volume)

• Combined Gas Law

• Charle's Law

• Boyle's Law

• Avogadros Ideal Gas Law

• none are correct

Combined Gas Law

• A helium balloon has a volume of 50.0 L at 25°C and 1.08 atm. What Volume will it have at 0.855 atm and 10°C?

  • Step one Identify all the information we have

    • V₁=

    • P₁=

    • T₁=

    • V₂=

    • P₂=

    • T₂=​

    ​

Experience Chemistry | Lesson 9.2.2

Combined Gas Law

• A helium balloon has a volume of 50.0 L at 25°C and 1.08 atm. What Volume will it have at 0.855 atm and 10°C?

  • Step one Identify all the information we have

    • V₁= 50.0

    • P₁=1.08

    • T₁=298

    • V₂=

    • P₂=0.855

    • T₂=​283

  • Step 2: Plug in our values to solve

    ​

Experience Chemistry | Lesson 9.2.2

Fill in the Blank

A helium balloon has a volume of 50.0 L at 25°C and 1.08 atm. What Volume will it have at 0.855 atm and 10°C? **Round to two decimal places**

Combined Gas Law

• The volume of a gas at 27°C and 0.2 atm is 80 mL. What Volume will it have at standard conditions?

  • Step one Identify all the information we have

    • V₁=

    • P₁=

    • T₁=

    • V₂=

    • P₂=

    • T₂=​

    ​

Experience Chemistry | Lesson 9.2.2

Combined Gas Law

• The volume of a gas at 27°C and 0.2 atm is 80 mL. What Volume will it have at STP conditions?

  • Step one Identify all the information we have

    • V₁= 80

    • P₁=0.2

    • T₁= 27 + 273 = 300 K

    • V₂=

    • P₂= 1 atm

    • T₂=​ 0 + 273= 273 K

  • Step two: Plug in your values and solve

Experience Chemistry | Lesson 9.2.2

Fill in the Blank

The volume of a gas at 27°C and 0.2 atm is 80 mL. What Volume will it have at STP conditions? **Round to Two Decimal Places**