Pentane is one of the most volatile of the hydrocarbons in gasoline. At 298.15 K, the following enthalpies of formation are given for pentane: Δ t H ° [ C z H 12 ( 1 ) ] = − 173.5 kJ mol − 1 ; Δ t H ° [ C z H 12 ( g ) ] = − 146.9 kJ Estimate the normal boiling point of pentane. Estimate Δ T G ° for pentane at 298 K. Comment on the significance of the sign of Δ v a c G ° for pentane at 298 K.
Pentane is one of the most volatile of the hydrocarbons in gasoline. At 298.15 K, the following enthalpies of formation are given for pentane: Δ t H ° [ C z H 12 ( 1 ) ] = − 173.5 kJ mol − 1 ; Δ t H ° [ C z H 12 ( g ) ] = − 146.9 kJ Estimate the normal boiling point of pentane. Estimate Δ T G ° for pentane at 298 K. Comment on the significance of the sign of Δ v a c G ° for pentane at 298 K.
Solution Summary: The author explains that the normal boiling point of pentane should be predicted. The standard enthalpy for a reaction is calculated by the formula.
Pentane is one of the most volatile of the hydrocarbons in gasoline. At 298.15 K, the following enthalpies of formation are given for pentane:
Δ
t
H
°
[
C
z
H
12
(
1
)
]
=
−
173.5
kJ
mol
−
1
;
Δ
t
H
°
[
C
z
H
12
(
g
)
]
=
−
146.9
kJ
Estimate the normal boiling point of pentane.
Estimate
Δ
T
G
°
for pentane at 298 K.
Comment on the significance of the sign of
Δ
v
a
c
G
°
for pentane at 298 K.
can someone draw out the reaction mechanism for this reaction showing all bonds, intermediates and side products
Comment on the general features of the 1H-NMR spectrum of isoamyl ester provided below
What would be the best choices for the missing reagents 1 and 3 in this synthesis?
1. PPh3
3
2. n-BuLi
• Draw the missing reagents in the drawing area below. You can draw them in any arrangement you like.
• Do not draw the missing reagent 2. If you draw 1 correctly, we'll know what it is.
• Note: if one of your reagents needs to contain a halogen, use bromine.
Click and drag to start drawing a structure.
Identify the missing organic reactants in the following reaction:
X + Y
H+
two steps
Note: This chemical equation only focuses on the important organic molecules in the reaction. Additional inorganic or small-molecule reactants or products
(like H2O) are not shown.
In the drawing area below, draw the skeletal ("line") structures of the missing organic reactants X and Y. You may draw the structures in any arrangement that
you like, so long as they aren't touching.
Click and drag to start drawing a
structure.
Х
:
Chapter 13 Solutions
General Chemistry: Principles and Modern Applications (11th Edition)
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