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2H2 + 3SiO2 🔥→ Si + 2H2SiO3

The reaction of hydrogen and silicon dioxide yields silicon and metasilicic acid (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related reactions
  5. 5Related categories

Reaction data

Chemical equation

General equation

Reaction of reducing species and reducible species
Reducing speciesReducing agent + Reducible speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of hydrogen and silicon dioxide

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
H2Hydrogen2
Reducing
Reducing
SiO2Silicon dioxide3
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
SiSilicon1
Reduced
H2SiO3Metasilicic acid2
Oxidized

Thermodynamic changes

Changes in standard condition (1)

Reaction of hydrogen and silicon dioxide
ΔrG385.1 kJ/mol
K0.34 × 10−67
pK67.47
2H2Gas + 3SiO2Crystalline solidα-quartz
🔥
SiCrystalline solid + 2H2SiO3Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
355.4385.1−100
per 1 mol of
177.7192.6−50.0
per 1 mol of
118.5128.4−33.3
per 1 mol of
355.4385.1−100
per 1 mol of
177.7192.6−50.0

Changes in standard condition (2)

Reaction of hydrogen and silicon dioxide
2H2Gas + 3SiO2Crystalline solidα-quartz
🔥
SiAmorphous solid + 2H2SiO3Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
359.6
per 1 mol of
179.8
per 1 mol of
119.9
per 1 mol of
359.6
per 1 mol of
179.8

Changes in standard condition (3)

Reaction of hydrogen and silicon dioxide
ΔrG381.5 kJ/mol
K0.15 × 10−66
pK66.84
2H2Gas + 3SiO2Crystalline solidα-cristobalite
🔥
SiCrystalline solid + 2H2SiO3Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
351.0381.5−103
per 1 mol of
175.5190.8−51.5
per 1 mol of
117.0127.2−34.3
per 1 mol of
351.0381.5−103
per 1 mol of
175.5190.8−51.5

Changes in standard condition (4)

Reaction of hydrogen and silicon dioxide
2H2Gas + 3SiO2Crystalline solidα-cristobalite
🔥
SiAmorphous solid + 2H2SiO3Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
355.2
per 1 mol of
177.6
per 1 mol of
118.4
per 1 mol of
355.2
per 1 mol of
177.6

Changes in standard condition (5)

Reaction of hydrogen and silicon dioxide
ΔrG381.0 kJ/mol
K0.18 × 10−66
pK66.75
2H2Gas + 3SiO2Crystalline solidα-tridymite
🔥
SiCrystalline solid + 2H2SiO3Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
349.8381.0−105
per 1 mol of
174.9190.5−52.5
per 1 mol of
116.6127.0−35.0
per 1 mol of
349.8381.0−105
per 1 mol of
174.9190.5−52.5

Changes in standard condition (6)

Reaction of hydrogen and silicon dioxide
2H2Gas + 3SiO2Crystalline solidα-tridymite
🔥
SiAmorphous solid + 2H2SiO3Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
354.0
per 1 mol of
177.0
per 1 mol of
118.0
per 1 mol of
354.0
per 1 mol of
177.0

Changes in standard condition (7)

Reaction of hydrogen and silicon dioxide
ΔrG367.3 kJ/mol
K0.45 × 10−64
pK64.35
2H2Gas + 3SiO2Amorphous solid
🔥
SiCrystalline solid + 2H2SiO3Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
333.1367.3−115
per 1 mol of
166.6183.7−57.5
per 1 mol of
111.0122.4−38.3
per 1 mol of
333.1367.3−115
per 1 mol of
166.6183.7−57.5

Changes in standard condition (8)

Reaction of hydrogen and silicon dioxide
2H2Gas + 3SiO2Amorphous solid
🔥
SiAmorphous solid + 2H2SiO3Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
337.3
per 1 mol of
168.7
per 1 mol of
112.4
per 1 mol of
337.3
per 1 mol of
168.7

Changes in aqueous solution

Reaction of hydrogen and silicon dioxide
2H2Un-ionized aqueous solution + 3SiO2Un-ionized aqueous solution
🔥
SiCrystalline solid + 2H2SiO3Un-ionized aqueous solution
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
333.8
per 1 mol of
166.9
per 1 mol of
111.3
per 1 mol of
333.8
per 1 mol of
166.9

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
H2 (g)0[1]0[1]130.684[1]28.824[1]
H2 (ao)-4.2[1]17.6[1]577[1]
SiO2 (cr)
α-quartz
-910.94[1]-856.64[1]41.84[1]44.43[1]
SiO2 (cr)
α-cristobalite
-909.48[1]-855.43[1]42.68[1]44.18[1]
SiO2 (cr)
α-tridymite
-909.06[1]-855.26[1]43.5[1]44.60[1]
SiO2 (am)-903.49[1]-850.70[1]46.9[1]44.4[1]
SiO2 (g)-322[1]
SiO2 (ao)-897.0[1]
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (am):Amorphous solid

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
Si (cr)0[1]0[1]18.83[1]20.00[1]
Si (am)4.2[1]
Si (g)455.6[1]411.3[1]167.97[1]22.251[1]
H2SiO3 (cr)-1188.7[1]-1092.4[1]134[1]
H2SiO3 (ao)-1182.8[1]-1079.4[1]109[1]
* (cr):Crystalline solid, (am):Amorphous solid, (g):Gas, (ao):Un-ionized aqueous solution

References

List of references

  1. 1