Question

State in your own words what is meant by the additive nature of heats of reaction?

Answer 1

The additive nature of the heats of reaction means that the total energy or heat of a system is equal to the sum of the energies of its parts.

It is also know as Hess' law of constant heat summation.

Hence,

△HR = △H1 + △H2 + △H3 + △H4 + ….

Where,

Delta H refers to the change in heat.

Example:-

$S + O_{2}$  → $SO_{2}$, where, △H1 = −70.96 KCal/mol

$SO_{2} + 12O_{2}$ → $SO_{3}$, where, △H2 = −23.49KCal/mol

Net Reaction:-

$S + 32O_{2}$ → $SO_{3}$  

Hence, as heats of reaction are additive in nature,

△HR = △H1 + △H2

△HR = -70.96 + (-23.49) = -94.45 KCal/mol

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Answer 2

Hess's Law of Constant Heat Summation, often known as Hess's Law or simply Hess's Law, effectively explains the addictive nature of heat in reactions by stating that regardless of the number of stages or steps in a reaction, the reaction's overall enthalpy change equals the sum of all changes. The fact that enthalpy is a state function is demonstrated by this law.

Constant Heat- A number that is regarded as constant across a series of computations involving the heat of bodies is known as the constant heat.

Enthalpy- A characteristic of a system's thermodynamics determined by its pressure, volume, and internal energy added together

Enthalpy Change- The quantity of energy lost or gained during a reaction is generally similar to the enthalpy change of the process.

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