Used in welding metals, the reaction of acetylene with oxygen has Δ H ° = − 1256 kJ: C 2 H 2 ( g ) + 5 / 2 O 2 ( g ) → H 2 O ( g ) + 2 C O 2 ( g ) Δ H ° = − 1256.2 kJ How much PV work is done in kilojoules and what is the value of Δ E in kilojoules for the reaction of 6.50 g of acetylene at atmospheric pressure if the volume change is -2.80 L?
Used in welding metals, the reaction of acetylene with oxygen has Δ H ° = − 1256 kJ: C 2 H 2 ( g ) + 5 / 2 O 2 ( g ) → H 2 O ( g ) + 2 C O 2 ( g ) Δ H ° = − 1256.2 kJ How much PV work is done in kilojoules and what is the value of Δ E in kilojoules for the reaction of 6.50 g of acetylene at atmospheric pressure if the volume change is -2.80 L?
Solution Summary: The author explains that the PV work done in kJ and change in internal energy for the reaction needs to be determined.
Used in welding metals, the reaction of acetylene with oxygen has
Δ
H
°
=
−
1256
kJ:
C
2
H
2
(
g
)
+
5
/
2
O
2
(
g
)
→
H
2
O
(
g
)
+
2
C
O
2
(
g
)
Δ
H
°
=
−
1256.2
kJ
How much PV work is done in kilojoules and what is the value of
Δ
E
in kilojoules for the reaction of 6.50 g of acetylene at atmospheric pressure if the volume change is -2.80 L?
Part III. Arrange the following carbons (in blue) in order of increasing chemical shift.
HO
B
NH 2
A
CI
6.
Choose the compound that will produce the spectrum below and assign the signals as carbonyl, aryl, or alkyl.
100
ō (ppm)
50
0
7.
200
150
Assign all of the protons on the spectrum below.
8.
A
B
4
E
C
3
ō (ppm)
2
1
0
Choose the compound that will produce the spectrum below and assign the signals to the corresponding
protons.
OH
6
OH
3
2
1
0
4
ō (ppm)
In the Thermo Fisher application note about wine analysis (Lesson 3), the following
chromatogram was collected of nine components of wine. If peak 3 has a retention time of
3.15 minutes and a peak width of 0.070 minutes, and peak 4 has a retention time of 3.24
minutes and a peak width of 0.075 minutes, what is the resolution factor between the two
peaks? [Hint: it will help to review Lesson 2 for this question.]
MAU
300
200
T
34
5
100-
1 2
CO
6
7
8
9
0
2.4
2.6
2.8
3.0 3.2 3.4
3.6
3.8 4.0 4.2
4.4
4.6
4.8
5.0
5.2
Minutes
3.22
0.62
1.04
O 1.24
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