First Law of Thermodynamics | Sign convention | Work done by Gas | Work from P-V graph | Change in internal energy | Molar Heat capacities: Cp, Cv and gamma for gases and gaseous mixture

Isochoric, Isobaric, Isothermal and Adiabatic Process | First Law of Thermodynamics | Sign convention | Work done by Gas | Work from P-V graph based Questions

The law of thermodynamics arising from conversion of heat energy into work.

State first law of thermodynamics and state the relation between the change in internal energy (DeltaU) , work done (W) and heat (Q).

In an isothermal expansion change in internal energy and work done by the gas are respectively

In a thermodynamic process on an ideal diatomic gas, work done by the gas is eta times. The heat supplied (eta lt 1) . The molar heat capacity of the gas for the process is

First law of thermodynamics is the general law of conservation of energy as applied to heat energy. According to this law, whenever heat is added to a system, it transforms to an equal amount of some other forms of energy. If dQ= a small amount of heat supplied to the system, dW= small amount of work done by the system and dU= small change in internal energy of the system, then dQ=dU+dW . Read the above passage and answer the following questions: (i) The amount of heat obsorbed by a gas is 10 cals and work done on the gas in 58J . Calculate increase in internal energy of the gas. (ii) What values of life do you learn fron this law?

In thermodynamic process, 200 Joules of heat is given to a gas and 100 Joules of work is also done on it. The change in internal energy of the gas is

Using the law of equipartition of energy , detemine the values of C_p, C_V and gamma for diatomic gas.