Illustrated Glossary of Organic Chemistry
Δ
H
:
The difference in
enthalpy
between two systems. Can be roughly estimated as the difference in
bond energies
between the two systems.
CH
4
+ 2 O
2
CO
2
+ 2
H
2
O
By definition, Δ
H
=
H
(
products
) -
H
(
reactants
). So for the
combustion
of
methane
, Δ
H
= [
H
(
CO
2
) + 2
H
(
H
2
O
)] - [
H
(
CH
4
) - 2
H
(O
2
)].
Related terms:
ΔE
,
ΔEN
,
Δ
G
,
Δ
G
++
,
Δ
H
f
0
,
enthalpy of formation
,
enthalpy of combustion
,
enthalpy of hydrogenation
,
Δ
S
,
K
eq
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