Home
Chemical reactions
2Cs2O + 2Cl2 → 4CsCl + O2

2Cs₂O + 2Cl₂ → 4CsCl + O₂

Last updated: June 13, 2022

Reaction of caesium oxide and chlorine: 2Cs₂OCaesium oxide + 2Cl₂Chlorine
⟶
4CsClCaesium chloride + O₂Oxygen

The reaction of caesium oxide and chlorine yields caesium chloride and oxygen. This reaction is an oxidation-reduction reaction and is classified as follows:

Reaction of hardly oxidizable species and oxidizing species

Table of contents

Reaction data

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
Cs₂O	Caesium oxide	2	Reducing	Hardly oxidizable
Cl₂	Chlorine	2	Oxidizing	Oxidizing

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
CsCl	Caesium chloride	4	Reduced	–
O₂	Oxygen	1	Oxidized	–

Thermodynamic changes

Changes in standard condition

Reaction of caesium oxide and chlorine ◆ Δ_rG −1041.84 kJ/mol K 3.33 × 10¹⁸² pK −182.52: 2Cs₂OCrystalline solid + 2Cl₂Gas
⟶
4CsClCrystalline solid + O₂Gas

	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	−1080.62	−1041.84	−130.03	19.46
per 1 mol of Caesium oxide	−540.310	−520.920	−65.015	9.730
per 1 mol of Chlorine	−540.310	−520.920	−65.015	9.730
per 1 mol of Caesium chloride	−270.155	−260.460	−32.508	4.865
per 1 mol of Oxygen	−1080.62	−1041.84	−130.03	19.46

Changes in aqueous solution (1)

Reaction of caesium oxide and chlorine ◆ Δ_rG −1090.56 kJ/mol K 1.14 × 10¹⁹¹ pK −191.06: 2Cs₂OCrystalline solid + 2Cl₂Un-ionized aqueous solution
⟶
4CsClIonized aqueous solution + O₂Gas

	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	−963.4	−1090.56	428	–
per 1 mol of Caesium oxide	−481.7	−545.280	214	–
per 1 mol of Chlorine	−481.7	−545.280	214	–
per 1 mol of Caesium chloride	−240.8	−272.640	107	–
per 1 mol of Oxygen	−963.4	−1090.56	428	–

Changes in aqueous solution (2)

Reaction of caesium oxide and chlorine ◆ Δ_rG −1074.2 kJ/mol K 1.55 × 10¹⁸⁸ pK −188.19: 2Cs₂OCrystalline solid + 2Cl₂Un-ionized aqueous solution
⟶
4CsClIonized aqueous solution + O₂Un-ionized aqueous solution

	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	−975.1	−1074.2	333	–
per 1 mol of Caesium oxide	−487.6	−537.10	167	–
per 1 mol of Chlorine	−487.6	−537.10	167	–
per 1 mol of Caesium chloride	−243.8	−268.55	83.3	–
per 1 mol of Oxygen	−975.1	−1074.2	333	–

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
Cs₂O (cr)	-345.77^[1]	-308.14^[1]	146.86^[1]	75.98^[1]
Cl₂ (g)	0^[1]	0^[1]	223.066^[1]	33.907^[1]
Cl₂ (ao)	-23.4^[1]	6.94^[1]	121^[1]	–

* (cr):Crystalline solid, (g):Gas, (ao):Un-ionized aqueous solution

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
CsCl (cr)	-443.04^[1]	-414.53^[1]	101.17^[1]	52.47^[1]
CsCl (g)	-240.20^[1]	-257.80^[1]	255.96^[1]	36.94^[1]
CsCl (ai)	-425.43^[1]	-423.24^[1]	189.54^[1]	-146.9^[1]
O₂ (g)	0^[1]	0^[1]	205.138^[1]	29.355^[1]
O₂ (ao)	-11.7^[1]	16.4^[1]	110.9^[1]	–

* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution

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	−1041.84 kJ/mol
K	3.33 × 10¹⁸²
pK	−182.52

Δ_rG	−1090.56 kJ/mol
K	1.14 × 10¹⁹¹
pK	−191.06

Δ_rG	−1074.2 kJ/mol
K	1.55 × 10¹⁸⁸
pK	−188.19

2Cs2O + 2Cl2 → 4CsCl + O2

Reaction data

Chemical equation

General equation

Oxidation state of each atom