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Chemical reactions
2Cd + MnO2 🔥→ 2CdO + Mn

2Cd + MnO₂ 🔥→ 2CdO + Mn

Last updated: June 13, 2022

Reaction of cadmium and manganese(IV) oxide: 2CdCadmium + MnO₂Manganese(IV) oxide
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2CdOCadmium oxide + MnManganese

The reaction of cadmium and manganese(IV) oxide yields cadmium oxide and manganese (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Reaction of reducing species and reducible species

Table of contents

Reaction data

Chemical equation

Reaction of cadmium and manganese(IV) oxide: 2CdCadmium + MnO₂Manganese(IV) oxide
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2CdOCadmium oxide + MnManganese

General equation

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

Oxidation state of each atom

Reaction of cadmium and manganese(IV) oxide

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
Cd	Cadmium	2	Reducing	Reducing
MnO₂	Manganese(IV) oxide	1	Oxidizing	Reducible

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
CdO	Cadmium oxide	2	Oxidized	–
Mn	Manganese	1	Reduced	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of cadmium and manganese(IV) oxide ◆ Δ_rG 8.3 kJ/mol K 0.35 × 10⁻¹ pK 1.45: 2CdCrystalline solidγ + MnO₂Crystalline solid
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2CdOCrystalline solid + MnCrystalline solidα

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	3.6	8.3	−15.0	7.08
per 1 mol of Cadmium	1.8	4.2	−7.50	3.54
per 1 mol of Manganese(IV) oxide	3.6	8.3	−15.0	7.08
per 1 mol of Cadmium oxide	1.8	4.2	−7.50	3.54
per 1 mol of Manganese	3.6	8.3	−15.0	7.08

Changes in standard condition (2)

Reaction of cadmium and manganese(IV) oxide: 2CdCrystalline solidγ + MnO₂Crystalline solid
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2CdOCrystalline solid + MnCrystalline solidβ

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	–	−12.6	7.29
per 1 mol of Cadmium	–	–	−6.30	3.65
per 1 mol of Manganese(IV) oxide	–	–	−12.6	7.29
per 1 mol of Cadmium oxide	–	–	−6.30	3.65
per 1 mol of Manganese	–	–	−12.6	7.29

Changes in standard condition (3)

Reaction of cadmium and manganese(IV) oxide ◆ Δ_rG 9.8 kJ/mol K 0.19 × 10⁻¹ pK 1.72: 2CdCrystalline solidγ + MnO₂Crystalline solid
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2CdOCrystalline solid + MnCrystalline solidγ

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	5.2	9.8	−14.5	8.33
per 1 mol of Cadmium	2.6	4.9	−7.25	4.17
per 1 mol of Manganese(IV) oxide	5.2	9.8	−14.5	8.33
per 1 mol of Cadmium oxide	2.6	4.9	−7.25	4.17
per 1 mol of Manganese	5.2	9.8	−14.5	8.33

Changes in standard condition (4)

Reaction of cadmium and manganese(IV) oxide: 2CdCrystalline solidγ + MnO₂Amorphous solidprecipitated
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2CdOCrystalline solid + MnCrystalline solidα

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−13.9	–	–	–
per 1 mol of Cadmium	−6.95	–	–	–
per 1 mol of Manganese(IV) oxide	−13.9	–	–	–
per 1 mol of Cadmium oxide	−6.95	–	–	–
per 1 mol of Manganese	−13.9	–	–	–

Changes in standard condition (5)

Reaction of cadmium and manganese(IV) oxide: 2CdCrystalline solidγ + MnO₂Amorphous solidprecipitated
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2CdOCrystalline solid + MnCrystalline solidβ

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	–	–	–
per 1 mol of Cadmium	–	–	–	–
per 1 mol of Manganese(IV) oxide	–	–	–	–
per 1 mol of Cadmium oxide	–	–	–	–
per 1 mol of Manganese	–	–	–	–

Changes in standard condition (6)

Reaction of cadmium and manganese(IV) oxide: 2CdCrystalline solidγ + MnO₂Amorphous solidprecipitated
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2CdOCrystalline solid + MnCrystalline solidγ

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−12.4	–	–	–
per 1 mol of Cadmium	−6.20	–	–	–
per 1 mol of Manganese(IV) oxide	−12.4	–	–	–
per 1 mol of Cadmium oxide	−6.20	–	–	–
per 1 mol of Manganese	−12.4	–	–	–

Changes in standard condition (7)

Reaction of cadmium and manganese(IV) oxide ◆ Δ_rG 9.5 kJ/mol K 0.22 × 10⁻¹ pK 1.66: 2CdCrystalline solidα + MnO₂Crystalline solid
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2CdOCrystalline solid + MnCrystalline solidα

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	4.8	9.5	−15.0	–
per 1 mol of Cadmium	2.4	4.8	−7.50	–
per 1 mol of Manganese(IV) oxide	4.8	9.5	−15.0	–
per 1 mol of Cadmium oxide	2.4	4.8	−7.50	–
per 1 mol of Manganese	4.8	9.5	−15.0	–

Changes in standard condition (8)

Reaction of cadmium and manganese(IV) oxide: 2CdCrystalline solidα + MnO₂Crystalline solid
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⟶
2CdOCrystalline solid + MnCrystalline solidβ

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	–	−12.6	–
per 1 mol of Cadmium	–	–	−6.30	–
per 1 mol of Manganese(IV) oxide	–	–	−12.6	–
per 1 mol of Cadmium oxide	–	–	−6.30	–
per 1 mol of Manganese	–	–	−12.6	–

Changes in standard condition (9)

Reaction of cadmium and manganese(IV) oxide ◆ Δ_rG 10.9 kJ/mol K 0.12 × 10⁻¹ pK 1.91: 2CdCrystalline solidα + MnO₂Crystalline solid
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2CdOCrystalline solid + MnCrystalline solidγ

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	6.4	10.9	−14.5	–
per 1 mol of Cadmium	3.2	5.45	−7.25	–
per 1 mol of Manganese(IV) oxide	6.4	10.9	−14.5	–
per 1 mol of Cadmium oxide	3.2	5.45	−7.25	–
per 1 mol of Manganese	6.4	10.9	−14.5	–

Changes in standard condition (10)

Reaction of cadmium and manganese(IV) oxide: 2CdCrystalline solidα + MnO₂Amorphous solidprecipitated
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⟶
2CdOCrystalline solid + MnCrystalline solidα

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−12.7	–	–	–
per 1 mol of Cadmium	−6.35	–	–	–
per 1 mol of Manganese(IV) oxide	−12.7	–	–	–
per 1 mol of Cadmium oxide	−6.35	–	–	–
per 1 mol of Manganese	−12.7	–	–	–

Changes in standard condition (11)

Reaction of cadmium and manganese(IV) oxide: 2CdCrystalline solidα + MnO₂Amorphous solidprecipitated
🔥
⟶
2CdOCrystalline solid + MnCrystalline solidβ

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	–	–	–
per 1 mol of Cadmium	–	–	–	–
per 1 mol of Manganese(IV) oxide	–	–	–	–
per 1 mol of Cadmium oxide	–	–	–	–
per 1 mol of Manganese	–	–	–	–

Changes in standard condition (12)

Reaction of cadmium and manganese(IV) oxide: 2CdCrystalline solidα + MnO₂Amorphous solidprecipitated
🔥
⟶
2CdOCrystalline solid + MnCrystalline solidγ

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−11.2	–	–	–
per 1 mol of Cadmium	−5.60	–	–	–
per 1 mol of Manganese(IV) oxide	−11.2	–	–	–
per 1 mol of Cadmium oxide	−5.60	–	–	–
per 1 mol of Manganese	−11.2	–	–	–

Changes in aqueous solution

Reaction of cadmium and manganese(IV) oxide ◆ Δ_rG 8.3 kJ/mol K 0.35 × 10⁻¹ pK 1.45: 2CdCrystalline solidγ + MnO₂Crystalline solid
🔥
⟶
2CdOCrystalline solid + MnCrystalline solidα

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	3.6	8.3	−15.0	7.08
per 1 mol of Cadmium	1.8	4.2	−7.50	3.54
per 1 mol of Manganese(IV) oxide	3.6	8.3	−15.0	7.08
per 1 mol of Cadmium oxide	1.8	4.2	−7.50	3.54
per 1 mol of Manganese	3.6	8.3	−15.0	7.08

Thermodynamic data of reactants

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
Cd (cr) γ	0^[1]	0^[1]	51.76^[1]	25.98^[1]
Cd (cr) α	-0.59^[1]	-0.59^[1]	51.76^[1]	–
Cd (g)	112.01^[1]	77.41^[1]	167.746^[1]	20.786^[1]
MnO₂ (cr)	-520.03^[1]	-465.14^[1]	53.05^[1]	54.14^[1]
MnO₂ (am) precipitated	-502.5^[1]	–	–	–

* (cr):Crystalline solid, (g):Gas, (am):Amorphous solid

Thermodynamic data of products

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
CdO (cr)	-258.2^[1]	-228.4^[1]	54.8^[1]	43.43^[1]
Mn (cr) α	0^[1]	0^[1]	32.01^[1]	26.32^[1]
Mn (cr) β	–	–	34.39^[1]	26.53^[1]
Mn (cr) γ	1.55^[1]	1.42^[1]	32.43^[1]	27.57^[1]
Mn (g)	280.7^[1]	238.5^[1]	173.70^[1]	20.79^[1]

* (cr):Crystalline solid, (g):Gas

References

List of references

1
Janiel J. Reed (1989)
The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units
https://doi.org/10.18434/M32124
National Institute of Standards and Technology (NIST)
Citation list

Δ_rG	8.3 kJ/mol
K	0.35 × 10⁻¹
pK	1.45

Δ_rG	9.8 kJ/mol
K	0.19 × 10⁻¹
pK	1.72

Δ_rG	9.5 kJ/mol
K	0.22 × 10⁻¹
pK	1.66

Δ_rG	10.9 kJ/mol
K	0.12 × 10⁻¹
pK	1.91

2Cd + MnO2 🔥→ 2CdO + Mn

Reaction data

Chemical equation

General equation

Oxidation state of each atom

Reactants

Products

Thermodynamic changes

Changes in standard condition (1)

Changes in standard condition (2)

Changes in standard condition (3)

Changes in standard condition (4)

Changes in standard condition (5)

Changes in standard condition (6)

Changes in standard condition (7)

Changes in standard condition (8)

Changes in standard condition (9)

Changes in standard condition (10)

Changes in standard condition (11)

Changes in standard condition (12)

Changes in aqueous solution

Thermodynamic data of reactants

Thermodynamic data of products

References

List of references

Related reactions

Reactions with same reactants

Related categories

Type of reaction

General equation

Reactant

Product

2Cd + MnO₂ 🔥→ 2CdO + Mn