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Mg + 4HNO2 → Mg(NO2)2 + 2NO↑ + 2H2O

The reaction of magnesium and nitrous acid yields magnesium nitrite, nitrogen monoxide, and water (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 oxidizing species
Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of magnesium and nitrous acid

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
MgMagnesium1
Reducing
Reducing
HNO2Nitrous acid4
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
Mg(NO2)2Magnesium nitrite1
Oxidized
NONitrogen monoxide2
Reduced
H2OWater2

Thermodynamic changes

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
Mg (cr)0[1]0[1]32.68[1]24.89[1]
Mg (g)147.70[1]113.10[1]148.650[1]20.786[1]
HNO2 (g)
cis
-77.99[1]-42.94[1]248.76[1]44.77[1]
HNO2 (g)
trans
-80.12[1]-45.24[1]249.22[1]46.07[1]
HNO2 (g)-79.5[1]-46.0[1]254.1[1]45.6[1]
HNO2 (ao)-119.2[1]-50.6[1]135.6[1]
* (cr):Crystalline solid, (g):Gas, (ao):Un-ionized aqueous solution

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
Mg(NO2)2
NO (g)90.25[1]86.55[1]210.761[1]29.844[1]
H2O (cr)
H2O (l)-285.830[1]-237.129[1]69.91[1]75.291[1]
H2O (g)-241.818[1]-228.572[1]188.825[1]33.577[1]
* (g):Gas, (cr):Crystalline solid, (l):Liquid

References

List of references

  1. 1