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CuS + 2HBr → CuBr2 + H2S

The reaction of copper(II) sulfide and hydrogen bromide yields copper(II) bromide and hydrogen sulfide. This reaction is an acid-base reaction and is classified as follows:

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

Reaction data

Chemical equation

General equation

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
CuSCopper(II) sulfide1
Brønsted base
Salt of weak acid
HBrHydrogen bromide2
Brønsted acid
Strong acid

Products

Chemical formulaNameCoefficientTypeType in general
equation
CuBr2Copper(II) bromide1
Conjugate base
Salt of strong acid
H2SHydrogen sulfide1
Conjugate acid
Weak acid

Thermodynamic changes

Changes in standard condition

Reaction of copper(II) sulfide and hydrogen bromide
CuSCrystalline solid + 2HBrGas
CuBr2Crystalline solid + H2SGas
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
−36.5
per 1 mol of
−36.5
per 1 mol of
−18.3
per 1 mol of
−36.5
per 1 mol of
−36.5

Changes in aqueous solution (1)

Reaction of copper(II) sulfide and hydrogen bromide
CuSCrystalline solid + 2HBrIonized aqueous solution
CuBr2Crystalline solid + H2SGas
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
133.8
per 1 mol of
133.8
per 1 mol of
66.90
per 1 mol of
133.8
per 1 mol of
133.8

Changes in aqueous solution (2)

Reaction of copper(II) sulfide and hydrogen bromide
CuSCrystalline solid + 2HBrIonized aqueous solution
CuBr2Crystalline solid + H2SUn-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
114.7
per 1 mol of
114.7
per 1 mol of
57.35
per 1 mol of
114.7
per 1 mol of
114.7

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
CuS (cr)-53.1[1]-53.6[1]66.5[1]47.82[1]
HBr (g)-36.40[1]-53.45[1]198.695[1]29.142[1]
HBr (ai)-121.55[1]-103.96[1]82.4[1]-141.8[1]
* (cr):Crystalline solid, (g):Gas, (ai):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
CuBr2 (cr)-141.8[1]
CuBr2 (cr)
4 hydrate
-1326.3[1]
H2S (g)-20.63[1]-33.56[1]205.79[1]34.23[1]
H2S (ao)-39.7[1]-27.83[1]121[1]
* (cr):Crystalline solid, (g):Gas, (ao):Un-ionized aqueous solution

References

List of references

  1. 1