Decomposition of Water (Electrolysis)

2H2O → 2H2 + O2

Visão geral

Water decomposes into hydrogen and oxygen gases when an electric current is passed through it. This electrolysis reaction is the reverse of the synthesis of water. It requires a minimum voltage of 1.23 V at standard conditions, though practical electrolyzers use higher voltages.

Participantes

Papel Substância Coeficiente Estado
Reagente Water H₂O 2 (l)
Produto Oxygen O 1 (g)
Produto Hydrogen H 2 (g)

Exemplo do cotidiano

Green hydrogen production uses renewable electricity to split water, producing clean hydrogen fuel for vehicles and industry.

Importância industrial

A eletrólise da água é central na economia do hidrogénio verde, produzindo hidrogénio para células de combustível, síntese de amoníaco e produção de aço sem emissões de carbono.

Propriedades

Tipo
Decomposition
Reversível
Sim
Energia
Endotérmico
ΔH
571,6 kJ/mol

Reações relacionadas

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Frequently Asked Questions

What is the equation for Decomposition of Water (Electrolysis)?
The balanced equation is: 2H₂O → 2H₂ + O₂.
What type of reaction is Decomposition of Water (Electrolysis)?
Decomposition of Water (Electrolysis) is a decomposition reaction. It is reversible under certain conditions.
Is Decomposition of Water (Electrolysis) exothermic or endothermic?
Decomposition of Water (Electrolysis) is endothermic (absorbs energy). The enthalpy change (ΔH) is 571.6 kJ/mol.