Understanding the Combined Gas Law

This video tutorial covers the combined gas law, explaining its components: pressure, volume, and temperature, and emphasizing the need for temperature to be in Kelvin. It provides three examples: calculating new pressure, volume, and temperature using the law. The tutorial guides viewers through identifying variables, setting up equations, and solving them, highlighting the importance of significant figures and unit consistency.

What is the correct formula for the Combined Gas Law?

• V1/T1 = V2/T2

• P1/T1 = P2/T2

• P1V1/T1 = P2V2/T2

• P1V1 = P2V2

Why must temperature be converted to Kelvin in the Combined Gas Law?

• Because Celsius is not a standard unit

• To ensure the equation works properly

• To match the units of pressure

• To simplify the calculation

What should you do if a variable remains constant in a gas law problem?

• Double it in the equation

• Convert it to a different unit

• Include it in the equation

• Exclude it from the equation

In the first example problem, what is the initial temperature in Kelvin?

• 85 K

• 273 K

• 358 K

• 298 K

What is the final pressure calculated in the first example problem?

• 1.20 atm

• 0.85 atm

• 1.00 atm

• 0.77 atm

In the second example, what is the standard pressure in kilopascals?

• 1 atm

• 100 kPa

• 101.3 kPa

• 85 kPa

What is the new volume calculated in the second example problem?

• 920 mL

• 1200 mL

• 1000 mL

• 850 mL

In the final example, what is the initial pressure at STP?

• 1.2 atm

• 1 atm

• 101.3 kPa

• 0.85 atm

What is the final temperature calculated in the third example problem?

• 285 K

• 260 K

• 298 K

• 273 K

Why is it important to ensure unit consistency in gas law problems?

• To avoid errors in the final result

• To make calculations easier

• To use the same units as the reference table

• To simplify the equation