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Checking Gas Fill With a Balloon Mass 4 questions
Checking Gas Fill With a Balloon Mass
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class models balloons for a display. Empty balloons have the same mass. Each filled balloon has the same volume, temperature, and pressure during the first comparison. In the model, the mass of a gas blend at those conditions is between the masses of equal volumes of its two pure gases. The possible fills are helium, air, or a blend of the two. The reported masses are already corrected for air buoyancy.
| Balloon | Filled volume (L) | Total mass (g) |
|---|---|---|
| Empty reference | 0 | 3.0 |
| Filled with helium | 2.0 | 3.4 |
| Filled with air | 2.0 | 5.4 |
| Unknown fill | 2.0 | 4.4 |
Question 1
What is the mass of the gas alone in the unknown balloon?
- 0.4 g
- 1.4 g
- 3.0 g
- 4.4 g
Question 2
Compare the unknown gas mass with those of helium and air. Explain how the measurements support a blend of the two under the model.
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A second empty balloon also has a mass of 3.0 g. The class fills it with 3.0 L of the same unknown blend at the same temperature and pressure. The model treats gas mass as proportional to volume under these conditions.
Question 3
Predict the total mass of the second filled balloon. Show how the gas mass and the empty balloon mass enter your calculation.
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Question 4
Explain why multiplying the first unknown balloon’s total mass by 3.0/2.0 would overstate the new total mass.
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