Q1. A balloon is being filled with helium gas (He). 0.278 moles of Helium are added to the balloon, and a volume of 847 mL is recorded. How many liters is the balloon after 0.423 more moles of Helium are added?

Background

Topic: Avogadro’s Law (Gas Laws)

This question tests your understanding of the direct relationship between the number of moles of a gas and its volume at constant temperature and pressure.

Key Terms and Formulas

• Avogadro’s Law:

• = initial volume, = initial moles

• = final volume, = final moles

Step-by-Step Guidance

1. Convert the initial volume from mL to L:

2. Calculate the final number of moles:

3. Set up Avogadro’s Law:

4. Rearrange to solve for :

Try solving on your own before revealing the answer!

Q2. A balloon has 1.489 moles of He. The volume of the balloon was recorded to be 29.6 L. How many liters is the balloon after 2.14 g of He is removed?

Background

Topic: Avogadro’s Law (Gas Laws)

This question tests your ability to relate changes in the amount of gas (in moles) to changes in volume, using Avogadro’s Law.

Key Terms and Formulas

• Avogadro’s Law:

• Molar mass of He: 4.00 g/mol

Step-by-Step Guidance

1. Calculate the number of moles of He removed:

2. Find the final number of moles:

3. Set up Avogadro’s Law:

4. Rearrange to solve for :

Try solving on your own before revealing the answer!

Q3. A 0.350 mol sample occupies 7.24 L. What volume will 0.572 mol occupy under the same conditions?

Background

Topic: Avogadro’s Law (Gas Laws)

This question tests your ability to use the direct proportionality between moles and volume for a gas at constant temperature and pressure.

Key Terms and Formulas

• Avogadro’s Law:

Step-by-Step Guidance

1. Identify the known values: mol, L, mol

2. Set up Avogadro’s Law:

3. Rearrange to solve for :

Try solving on your own before revealing the answer!

Q4. The volume of air in a car tire is 6.3 L, and there are 4.2 mol nitrogen (N2) in the air mixture. A bicycle tire contains 2.7 L of air; how many moles of nitrogen are within the bicycle tire? Both tires contain the same air pressure, and assume a constant temperature.

Background

Topic: Avogadro’s Law (Gas Laws)

This question tests your ability to use the proportionality between volume and moles for gases at constant temperature and pressure.

Key Terms and Formulas

• Avogadro’s Law:

Step-by-Step Guidance

1. Identify the known values: L, mol, L

2. Set up Avogadro’s Law:

3. Rearrange to solve for :

Try solving on your own before revealing the answer!