Standard Enthalpies of Formation Flashcards
1
Q
What is the standard enthalpy of formation?
A
- ΔH°f
- Amount of energy released or absorbed when one mole of a compound is formed directly from its elements with all its substances in their standard state
2
Q
The standard state for an element is…
A
It’s most stable or common form at SATP
3
Q
What does SATP stand for?
A
- Standard ambient temperature pressure
- 25℃, 100KPa
4
Q
Metals standard state
A
- All metals are solid except mercury
5
Q
Diatomic molecules at SATP
A
- Hydrogen
- Oxygen
- Fluorine
- Bromine
- Iodine
- Nitrogen
- Chlorine
6
Q
Noble gases SATP
A
Gas state as neutral atoms
7
Q
Iodine SATP state
A
Solid
8
Q
Bromine SATP state
A
Liquid
9
Q
Carbon SATP
A
Graphite (solid)
10
Q
Oxygen SATP
A
O2 (gas)
11
Q
Sulphur SATP
A
S (solid)
12
Q
Phosphorus SATP
A
P4 (solid)
13
Q
What is the standard heat of formation of an element in its standard state?
A
ZERO
