You are planning lecture demonstration to illustrate an endothermic process. You want to lower the temperature of 1400 mL water in an insulated container from 25 to 10 °C. Approximately what mass of N H 4 C l ( s ) should you dissolve in the water to achieve the result? The heat of solution of N H 4 C I is + 14.7 k J / m o l N H 4 C I .
You are planning lecture demonstration to illustrate an endothermic process. You want to lower the temperature of 1400 mL water in an insulated container from 25 to 10 °C. Approximately what mass of N H 4 C l ( s ) should you dissolve in the water to achieve the result? The heat of solution of N H 4 C I is + 14.7 k J / m o l N H 4 C I .
You are planning lecture demonstration to illustrate an endothermic process. You want to lower the temperature of 1400 mL water in an insulated container from 25 to 10 °C. Approximately what mass of
N
H
4
C
l
(
s
)
should you dissolve in the water to achieve the result? The heat of solution of
N
H
4
C
I
is
+
14.7
k
J
/
m
o
l
N
H
4
C
I
.
Experiment:
Each team will be provided with 5g of a mixture of acetanilide and salicylic acid. You will divide it into three 1.5 g portions in separate 125 mL Erlenmeyer flasks savıng some for melting point analysis. Dissolve the mixture in each flask in ~60mL of DI water by heating to boiling on a hotplate. Take the flasks off the hotplate once you have a clear solution and let them stand on the bench top for 5 mins and then allow them to cool as described below.
Sample A-Let the first sample cool slowly to room temperature by letting it stand on your lab bench, with occasional stirring to promote crystallization.
Sample B-Cool the second sample 1n a tap-water bath to 10-15 °C
Sample C-Cool the third sample in an ice-bath to 0-2 °C
Results:
weight after recrystalization and melting point temp.
A=0.624g,102-115°
B=0.765g, 80-105°
C=1.135g, 77-108
What is the percent yield of A,B, and C.
Rel. Intensity
Q
1. Which one of the following is true of the compound
whose mass spectrum is shown
here? Explain how you decided.
100
a) It contains chlorine.
b) It contains bromine.
c) It contains neither chlorine nor bromine.
80-
60-
40-
20-
0.0
0.0
TT
40
80
120
160
m/z
2. Using the Table of IR Absorptions how could you
distinguish between these two
compounds in the IR?
What absorbance would one compound have that the
other compound does not?
HO
CI
Illustrate reaction mechanisms of
alkenes with water in the presence of
H2SO4, detailing each step of the
process. Please show steps of
processing. Please do both, I will
thumb up for sure
#1
#3
Chapter 7 Solutions
Selected Solutions Manual For General Chemistry: Principles And Modern Applications
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