Question

Kirchhoff's equation and its applications in chemistry

Answer 1

Answer:

Kirchoff's equation

kirchhoff's equation relates the heat of reaction with the specific heats of a system before and after the reaction. Where, Q is the heat energy evolved during the process at temperature 't' without change in volume and C is the specific heats of the reactants and C' is the specific heats of products.

Applications :

Kirchhoff's laws are used to help us understand how current and voltage work within a circuit. They can also be used to analyze complex circuits that can't be reduced to one equivalent resistance using what you already know about series and parallel resistors

Answer 2

Kirchhoff's law represents the variation of enthalpy of a reaction with temperature. Generally when the temperature increases, the enthalpy of the reactants and the products also increases which means that the enthalpy of the substance increases.

• It is used to find values of current, voltage and internal resistance in DC circuits.
• In chemistry it is represented by the following equation:
• ΔH=ΔU+nRT.
• where, ΔH-change in enthalpy, ΔU-change in internal energy, n-number of moles, R-gas constant and T-temperature.
• According to Kirchhoff’s law the ratio of emissive power to absorptive power is same for all surfaces at the same temperature and is equal to the emissive power of a perfectly black body at that temperature.
• Its applications include:
• Sand is a good absorber of heat and hence in deserts, days are very hot. According to Kirchhoff’s law, good absorbers are good emitters so nights there, are cold.
• A person with dark skin experiences more heat and cold as compared to a person of light skin because when the outside temperature is greater, the person with black skin absorbs more heat and when the outside temperature is less the person with black skin radiates more energy.

#SPJ2