Show that for an ideal gas, the work differential dw is not an exact differential.
admin We know that work differential dw is calculated as: dw= PdV ……………. (1) since volume V is a state function i.e. it is independent of the path hence dV is…
Define Enthalpy of Vaporizations and Enthalpy of Fusion
Enthalpy of Vaporizations: During evaporation of liquid, some absorption of heat from surroundings takes place. Hence, Liquid evaporation is fulfilled by increase in enthalpy. The increase in enthalpy while evaporation…
Derive the Relation between CP and CV in Gaseous Systems.
Relation between CP and CV in gaseous systems No external work is being done when a gas is heated at constant volume i.e. gas uses all the haet which is…
Show that in an Isothermal Expansion of an Ideal Gas ∆U=0 and ∆H=0
(a) We know that for one mole of an ideal gas, CV = (∂U/∂T) V Therefore, dU = CV dT For a finite change, ∆U = CV ∆T As for…
Calculate q, w, ∆U and ∆H for the reversible isothermal expansion of one mole of an ideal gas at 37oC from a volume of 20dm3 to a volume of 30 dm3
Temperature T = 37oC = 37 + 273 = 310 K Since the process is Isothermal, Therefore, ∆U=0 and ∆H = 0 (as for an isothermal expansion of an ideal…
Discuss the Expansion of an ideal gas and changes in Thermodynamic Properties.
We can calculate the change in change in thermodynamic properties like q , w , ∆U , ∆H with the help of first law of thermodynamics. The expansion can be…
In a certain process, 675 J of heat is absorbed by a system while 290 J of work is done on the system. What is the change in internal energy for the process?
As we know that if the quantity of heat transferred from the surrounding to the system is q and work done in the process is w, then the change in…
In a certain process, 6000 J of heat is added to a system while the system does work equivalent to 9000 J by expanding against the surrounding atmosphere. What is the change in internal energy for the system?
The absorption of heat by the system tends to raise the energy of the system. The performance of work by the system, on the other hand, tends to lower the…
Compare Isothermal Expansion and Adiabatic Expansion
Let us suppose that for an ideal gas, isothermal and adiabatic expansions have initial volume Vi and pressure be Pi to a common final volume Vf. If Piso and Padia…
In a certain process, 600 J of work is done on the system which gives off 250 J of heat. What is the change in internal energy for the process?
The absorption of heat by the system tends to raise the energy of the system. The performance of work by the system, on the other hand, tends to lower the…