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Comparing Vapor Over Sugar and Salt Models 4 questions
Comparing Vapor Over Sugar and Salt Models
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A classroom model puts 90 water particles in each of two containers. The solutes remain in the liquid. At the fixed temperature in this model, the water-vapor pressure equals 10 kPa multiplied by the fraction of independently moving liquid particles that are water.
| Container | Solute added (formula units or molecules) | Independently moving particles per solute unit |
|---|---|---|
| Sugar solution | 10 | 1 |
| Salt solution | 10 | 2 |
Question 1
Which solution has fewer water particles per 100 independently moving liquid particles?
- The sugar solution only
- The salt solution only
- They have the same water fraction.
- Neither contains water particles.
Question 2
Calculate the water-vapor pressure in the sugar model. Show how the liquid-particle fraction is used.
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Question 3
A student says adding the same number of solute units must give the same vapor pressure. Use both particle records to evaluate the claim.
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The class can change the number of salt formula units while keeping 90 water particles and the same temperature.
Question 4
Find the number of salt formula units that would match the sugar solution’s predicted vapor pressure.
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