Version 001 – Quiz 1 – David Laude (53015) 1
This print-out should have 8 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering. V1:1, V2:1, V3:1, V4:1,
V5:2.
You will have 20 minutes for the quiz.
Please make sure you write your version num-
bers on your scantron. Good luck!
ChemPrin3e T06 35
18:05, general, multiple choice, <1 min, fixed.
001 (part 1 of 1) 5 points
How much heat is required to vaporize 50.0
g of water if the initial temperature of the
water is 25.0◦C and the water is heated to
its boiling point where it is converted to
steam? The specific heat capacity of water
is 4.18 J ·(◦C)−1·g−1and the standard en-
thalpy of vaporization of water at its boiling
point is 40.7 kJ ·mol−1.
1. 169 kJ
2. 64.2 kJ
3. 40.7 kJ
4. 129 kJ correct
5. 23.5 kJ
Explanation:
m= 50 g Ti= 25◦C
Tf= 100◦CC= 4.18 J/g/◦C
∆Hvap = 40.7 kJ/mol
H=m C ∆T+m
MM ∆Hvap
= (50 g) (4.18 J/g/◦C)
×(100 −25)◦C1 kJ
1000 J
+50 g
18 g/mol (40.7 kJ/mol)
= 128.731 kJ
ChemPrin3e T08 34
14:10, basic, multiple choice, <1 min, fixed.
002 (part 1 of 1) 5 points
The phase diagram for CO2is given below.
Solid
Liquid
Vapor
Temperature, K
Pressure, atm
The triple point is at 5.1 atm and 217 K.
What happens if CO2(`) at 30 atm and 450 K
is released into a room at 1 atm and 298 K?
1. The liquid vaporizes. correct
2. The liquid remains stable.
3. The liquid and vapor are in equilibrium.
4. The liquid and solid are in equilibrium.
5. The liquid freezes.
Explanation:
Sparks dissolve 001
16:04, general, multiple choice, <1 min, fixed.
003 (part 1 of 1) 5 points
For an endothermic dissolution process, as
temperature increases, solubility
1. decreases.
2. increases. correct
3. stays the same.
Explanation:
Consider an endothermic process:
solid + heat →dissolved products
As heat is added, equilibrium will shift
towards a higher concentration of dissolved
products.
DAL Miscible
