Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. Set up a Hess's law cycle that will let you calculate Δ H ° for the conversion of methane to ethylene: C H 4 ( g ) → C 2 H 4 ( g ) + 2 H 2 ( g ) You can use the following information: 2 C 2 H 6 ( g ) + 7 O 2 ( g ) → 4 C O 2 ( g ) + 6 H 2 O ( l ) Δ H ° = − 3120.8 kJ C H 4 ( g ) + 2 O 2 ( g ) → C O 2 ( g ) + 2 H 2 O ( l ) Δ H ° = − 890.3 kJ C 2 H 4 ( g ) + H 2 ( g ) → C 2 H 6 ( g ) Δ H ° = − 136.3 kJ H 2 O ( l ) Δ H ° f = − 285.8 kJ/mol
Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. Set up a Hess's law cycle that will let you calculate Δ H ° for the conversion of methane to ethylene: C H 4 ( g ) → C 2 H 4 ( g ) + 2 H 2 ( g ) You can use the following information: 2 C 2 H 6 ( g ) + 7 O 2 ( g ) → 4 C O 2 ( g ) + 6 H 2 O ( l ) Δ H ° = − 3120.8 kJ C H 4 ( g ) + 2 O 2 ( g ) → C O 2 ( g ) + 2 H 2 O ( l ) Δ H ° = − 890.3 kJ C 2 H 4 ( g ) + H 2 ( g ) → C 2 H 6 ( g ) Δ H ° = − 136.3 kJ H 2 O ( l ) Δ H ° f = − 285.8 kJ/mol
Solution Summary: The author explains that the value of change in enthalpy for the conversion of methane to ethylene needs to be determined.
Hess's law can be used to calculate reaction enthalpies for hypothetical processes that can't be carried out in the laboratory. Set up a Hess's law cycle that will let you calculate
Δ
H
°
for the conversion of methane to ethylene:
C
H
4
(
g
)
→
C
2
H
4
(
g
)
+
2
H
2
(
g
)
You can use the following information:
2
C
2
H
6
(
g
)
+
7
O
2
(
g
)
→
4
C
O
2
(
g
)
+
6
H
2
O
(
l
)
Δ
H
°
=
−
3120.8
kJ
C
H
4
(
g
)
+
2
O
2
(
g
)
→
C
O
2
(
g
)
+
2
H
2
O
(
l
)
Δ
H
°
=
−
890.3
kJ
C
2
H
4
(
g
)
+
H
2
(
g
)
→
C
2
H
6
(
g
)
Δ
H
°
=
−
136.3
kJ
H
2
O
(
l
)
Δ
H
°
f
=
−
285.8
kJ/mol
€
+
Suppose the molecule in the drawing area below were reacted with H₂ over a platinum catalyst. Edit the molecule to show what would happen to it. That is, turn
it into the product of the reaction.
Also, write the name of the product molecule under the drawing area.
Name: ☐
H
C=0
X
H-
OH
HO-
H
HO-
-H
CH₂OH
×
Draw the Haworth projection of the disaccharide made by joining D-glucose and D-mannose with a ẞ(1-4) glycosidic bond. If the disaccharide has more than
one anomer, you can draw any of them.
Click and drag to start drawing a
structure.
X
Epoxides can be opened in aqueous acid or aqueous base to produce diols (molecules with two OH groups). In this question, you'll explore the
mechanism of epoxide opening in aqueous acid.
2nd attempt
Be sure to show all four bonds at stereocenters using hash and wedge lines.
0
0
Draw curved arrows to show how the epoxide reacts with hydronium ion.
100 +1:
1st attempt
Feedback
Be sure to show all four bonds at stereocenters using hash and wedge lines.
See Periodic Table
See Hint
H
A
5
F
F
Hr
See Periodic Table See Hint
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