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?
The Concept of Aromaticity
21.15 State the number of 2p orbital electrons in each molecule or ion.
(a)
(b)
(e)
(f)
(c)
(d)
(h)
(i)
DA
(k)
21.16 Which of the molecules and ions given in Problem 21.15 are aromatic according to the
Hückel criteria? Which, if planar, would be antiaromatic?
21.17 Which of the following structures are considered aromatic according to the Hückel
criteria?
---0-0
(a)
(b)
(c)
(d)
(e)
(h)
H
-H
.8.0-
21.18 Which of the molecules and ions from Problem 21.17 have electrons donated by a
heteroatom?
1. Show the steps necessary to make 2-methyl-4-nonene using a
Wittig reaction. Start with triphenylphosphine and an alkyl
halide. After that you may use any other organic or inorganic
reagents.
2. Write in the product of this reaction:
CH3
CH₂
(C6H5)₂CuLi
H₂O+
3. Name this compound properly, including stereochemistry.
H₂C
H3C
CH3
OH
4. Show the step(s) necessary to transform the compound on the
left into the acid on the right.
Bri
CH2
5. Write in the product of this
LiAlH4
Br
H₂C
OH
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage Learning
Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning
Chemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage Learning
General Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage Learning
Chemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning