Science > Chemistry > Chemical Thermodynamics and Energetics > Change in Internal Energy and Enthalpy In this article, we shall study to calculate the change in internal energy and change in enthalpy in a chemical reaction. Example – 01: For a particular reaction, the system absorbs 6 kJ of heat and does 1.5 kJ of […]
Science > Chemistry > Chemical Thermodynamics and Energetics > Heat of Reaction Of Different Processes In this article, we shall study change in enthalpy for different chemical processes. Enthalpy of Formation (ΔfH° or ΔformationH°): The change in enthalpy of a chemical reaction at a given temperature and pressure, when one mole of the substance is formed […]
Science > Chemistry > Chemical Thermodynamics and Energetics > Heat of Reaction The branch of chemistry which deals with the quantitative study of thermal or heat changes in various chemical reactions is known as thermochemistry. In this article, We shall discuss very important concept of chemistry i.e. heat of reaction. Thermochemical Equation: An equation which […]
Science > Chemistry > Chemical Thermodynamics and Energetics > Enthalpy of a System The enthalpy of system is defined as the sum of the internal energy of the system and energy that arises due to pressure and volume. It is denoted by letter H. Mathematically, H = U + PV Where, H = Enthalpy U […]
Science > Chemistry > Chemical Thermodynamics and Energetics > First Law of Thermodynamics In this article, we shall study the first law of thermodynamics and its application to different chemical processes. Zeroth Law of Thermodynamics: Statement: If two bodies (say A and B) are in thermal equilibrium of the third body (say C) then body […]
Science > Chemistry > Chemical Thermodynamics and Energetics > Concept of Maximum Work According to the first law of thermodynamics, ΔU = q + W In an isothermal process, ΔU = 0, ∴ q = – W Therefore, all the heat absorbed by the system is utilized to do work. […]
Science > Chemistry > Chemical Thermodynamics and Energetics > Work Done in Chemical Process Pressure Volume Work: Consider an ideal gas having definite mass (say n moles) be enclosed in a cylinder fitted with weightless, frictionless, tightly fitted, movable piston. Let ‘A’ be the area of the cross-section of the cylinder. Let the gas expand […]
Science > Chemistry > Chemical Thermodynamics and Energetics > Chemical Processes In this article, we shall discuss what is meant by process and different types of chemical processes. Process: It is the path or the operation by which a system changes from one state to another. A process causes a change in the value of […]