Thermo chemical Equation

 Thermo chemical equation which express the amount of heat absorbed or evolved along with the physical state of reactant & product involved in the reaction are called thermo chemical equation.

E.g. C₂H₅OH (L) + 3O₂ (g) → 2CO₂ (g) + 3H₂O (L)

∆ H = -1367 KJ/mol

Essentials of Thermo chemical Equation are

1. It should be balanced.
2. The physical state of reactant & product should be mentioned after the chemical formula.
3. The element which exhibit allotropy, allotropy forms must be mentioned.

 

S (Rhombic) + O₂ (g) → SO₂ (g) + 29.7.4 KJ

S (Monoclinic) + O₂ (g) → SO₂ (g) + 299.9 KJ

According to latest convention, the heat absorbed or evolved should be represented in the form of enthalpy change which should be given a +ve sign for endothermic reaction & -ve sign for exothermic reaction.

Enthalpy..........in the next topic