Hydrazine, a component of rocket fuel, undergoes combustion to yield N 2 and H 2 O: N 2 H 4 ( l ) + O 2 ( g ) → N 2 ( g ) + H 2 O ( l ) (a) Draw an electron-dot structure for hydrazine, predict the geometry about each nitrogen atom, and tell the hybridization of each nitrogen. (b) Use the following information to set up a Hess's law cycle, and then calculate Δ H ° for the combustion reaction. You will need to use fractional coefficients for some equations. 2 N H 3 ( g ) + 3 N 2 ( g ) → 4 N 2 ( g ) + 3 H 2 O ( l ) Δ H ° = − 1011. 2 kJ N 2 O ( g ) + 3 H 2 ( g ) → N 2 H 4 ( l ) + H 2 O ( l ) Δ H ° = − 317. 2 kJ 4 N H 3 ( g ) + O 2 ( g ) → 2 N 2 H 4 ( l ) + 2 H 2 O ( l ) Δ H ° = − 286.0 kJ H 2 O ( l ) Δ H ° f = − 285.8 kJ/mol (c) How much heat is released on combustion of 100.0 g ofhydrazine?
Hydrazine, a component of rocket fuel, undergoes combustion to yield N 2 and H 2 O: N 2 H 4 ( l ) + O 2 ( g ) → N 2 ( g ) + H 2 O ( l ) (a) Draw an electron-dot structure for hydrazine, predict the geometry about each nitrogen atom, and tell the hybridization of each nitrogen. (b) Use the following information to set up a Hess's law cycle, and then calculate Δ H ° for the combustion reaction. You will need to use fractional coefficients for some equations. 2 N H 3 ( g ) + 3 N 2 ( g ) → 4 N 2 ( g ) + 3 H 2 O ( l ) Δ H ° = − 1011. 2 kJ N 2 O ( g ) + 3 H 2 ( g ) → N 2 H 4 ( l ) + H 2 O ( l ) Δ H ° = − 317. 2 kJ 4 N H 3 ( g ) + O 2 ( g ) → 2 N 2 H 4 ( l ) + 2 H 2 O ( l ) Δ H ° = − 286.0 kJ H 2 O ( l ) Δ H ° f = − 285.8 kJ/mol (c) How much heat is released on combustion of 100.0 g ofhydrazine?
Solution Summary: The author explains the Lewis dot structure, which shows the bonding between atoms present in a molecule.
Hydrazine, a component of rocket fuel, undergoes combustion to yield N2 and H2O:
N
2
H
4
(
l
)
+
O
2
(
g
)
→
N
2
(
g
)
+
H
2
O
(
l
)
(a) Draw an electron-dot structure for hydrazine, predict the geometry about each nitrogen atom, and tell the hybridization of each nitrogen. (b) Use the following information to set up a Hess's law cycle, and then calculate
Δ
H
°
for the combustion reaction. You will need to use fractional coefficients for some equations.
2
N
H
3
(
g
)
+
3
N
2
(
g
)
→
4
N
2
(
g
)
+
3
H
2
O
(
l
)
Δ
H
°
=
−
1011.
2 kJ
N
2
O
(
g
)
+
3
H
2
(
g
)
→
N
2
H
4
(
l
)
+
H
2
O
(
l
)
Δ
H
°
=
−
317.
2 kJ
4
N
H
3
(
g
)
+
O
2
(
g
)
→
2
N
2
H
4
(
l
)
+
2
H
2
O
(
l
)
Δ
H
°
=
−
286.0
kJ
H
2
O
(
l
)
Δ
H
°
f
=
−
285.8
kJ/mol
(c) How much heat is released on combustion of 100.0 g ofhydrazine?
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
The diagram shows two
metals, A and B, which melt at
1000°C and 1400°C. State the
weight percentage of the
primary constituent (grains of
C) that would be obtained by
solidifying a 20% alloy of B.
1000°C
a+L
L+C
900°С
12
α
a+C
45
1200 C
L+y
140096
C+Y
a+ß
800°C
700°C
C+B
96
92
a+B
0
10
20
30
40
50
60
70 80 90 100
A
% peso B
B
8.
Choose the compound that will produce the spectrum below and assign the signals to the corresponding
protons.
2
4
3
ō (ppm)
OH
4
6 6
СОН
2
1
0
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