“I would sooner fail than not be among the greatest.” ~John Keats
NAME:______DATE:______
6.6 What is vapor pressure and how do we use Table H? ADPHS Instructor Ms. Kasia Room 109
UNIT 6: Solution and Gases
6.6 Vapor Pressure
AIM:
DO NOW:
VAPOR PRESSURE
KEY POINTS
LET’S TRY SOME
1. At 50oC, which substance exerts the most vapor pressure?
2. What is the vapor pressure of water at 105oC?
3. At what temperature does ethanol have a vapor pressure of 50kPa?
4. Find the boiling point of each liquid at oC.
NAME:______DATE:______
6.6 Vapor Pressure AHS Instructor Ms. Kasia Room 109
Unit 6 Solutions and Gases
6.6 Independent Practice/HWK (20 points)
Directions: Answer the following questions using your notes and the Reference Table.
1. A sample of ethanoic acid at 100oC has a vapor pressure of…
2. What is the vapor pressure of ethanol at 75oC?
3. What is the vapor pressure of propanone at 65°C?
4. What is the vapor pressure of water at 25°C?
5. At what temperature does ethanoic acid have a vapor pressure of 45kPa?
6. At what temperature does propanone have a vapor pressure of 10kPa?
7. At what temperature does water have a vapor pressure of 110kPa?
8. Find the vapor pressure of all 4 liquids at 75°C.
9. Find the vapor pressure of all 4 liquids at 50°C.
10. At what temperature does each liquid have a vapor pressure of 70 kPa?
11. At what temperature does each liquid have a vapor pressure of 90 kPa?
12. Which substance has the lowest vapor pressure at 75°C?
“I would sooner fail than not be among the greatest.” ~John Keats
(1) water
(2) propanone
(3) ethanoic acid
(4) ethanol
“I would sooner fail than not be among the greatest.” ~John Keats
13. Which liquid has the highest vapor pressure at 75°C?
“I would sooner fail than not be among the greatest.” ~John Keats
(1) ethanoic acid
(2) propanone
(3) ethanol
(4) water
“I would sooner fail than not be among the greatest.” ~John Keats
14. A liquid boils when the vapor pressure of the liquid equals the atmospheric pressure on the surface of the liquid. Using Reference Table H, determine the boiling point of water when the atmospheric pressure is 90.kPa.
15. At which temperature is the vapor pressure of ethanol equal to the vapor
pressure of propanone at 35°C?
“I would sooner fail than not be among the greatest.” ~John Keats
(1) 35°C
(2) 82°C
(3) 60.°C
(4) 95°C
“I would sooner fail than not be among the greatest.” ~John Keats
“I would sooner fail than not be among the greatest.” ~John Keats
A student prepares four aqueous solutions, each with a different solute. The mass of each dissolved solute is shown in the table below.
16. Which solution is saturated?
16. When 5 grams of KCl are dissolved in 50. grams of water at 25°C, the resulting mixture can be described as
(1) heterogeneous and unsaturated 2) heterogeneous and supersaturated
(3) homogeneous and unsaturated 4) homogeneous and supersaturated
17. An unsaturated solution is made by completely dissolving 20.0 grams of NaNO3 in 100.0 grams of water at 20.0°C.
a. Show a correct numerical setup for calculating the number of moles of NaNO3 (gram-formula mass = 85.0 grams per mole) used to make this unsaturated solution.
b. Determine the minimum mass of NaNO3 that must be added to this unsaturated solution to make a saturated solution at 20.0°C.
c. Identify one process that can be used to recover the NaNO3 from the unsaturated solution. [1]