Respuesta :
The chemical equation of the formation of liquid water is:
H₂(g) + 1/2 O₂ (g) [tex]\longrightarrow[/tex] H₂O (l)
What is the standard enthalpy of formation?
Standard enthalpy of formation is the enthalpy change when 1 mole of a compound is formed from its components in their most stable state of aggregation at a temperature of 298 K and pressure of 1 atm.
Enthalpy of formation can be described as the standard enthalpy of reaction where two or more reactants combine to produce one mole of the product. The standard enthalpy of formation can be measured in units in kilojoules per mole (kJ/mol), kilocalories per gram, or joule per mole.
All elements in their standard states such as oxygen gas, solid carbon ( in the form of graphite) have zero value of standard enthalpy of formation.
The standard enthalpy of the formation of liquid water is given −285.8KJ/mol, which means a negative value of the standard enthalpy of formation showing that the formation of water is exothermic in nature. From the chemical equation, 1 mole of water is formed from one mole of hydrogen and a half mole of oxygen gas.
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