The standard enthalpy of formation of ethane is determined as -192.5 kJ/mol.
Reaction for the formation of ethane
The reaction for the formation of ethane is given as;
2C + 3H₂ → C₂H₆
Where;
- C is carbon (graphite)
- H is hydrogen
- C₂H₆ is ethane
Standard enthalpy of formation of ethane
The standard enthalpy of formation of ethane is calculated as follows;
ΔH = ΔH₁ + ΔH₂ + ΔH₃
where;
- ΔH₁ is heat of formation of graphite = -286 kJ/mol
- ΔH₂ is heat of formation of hydrogen = -393.5 kJ/mol
- ΔH₃ is heat of formation of ethane = 1560 kJ/mol
2C + 3H₂ → C₂H₆
ΔH = 2(-286) + 3(-393.5) + 1(1560)
ΔH = -572 - 1180.5 + 1560
ΔH = -192.5 kJ/mol
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