Explain First law of Thermodynamics?
admin The 1st Law of Thermodynamics tells us that energy is neither created nor destroyed, thus the energy of the universe is a constant. However, energy can certainly be transferred from…
First Law of Thermodynamics
What is Enthalpy of a System?
Let us suppose that the state of a system changes at constant Pressure. Hence there will be change in volume of the system. Suppose volume changes from V1 to V2…
Prove that Inter energy is Independent of the path
Let us assume that a system is changing with respect to pressure as well as volume. Let the ‘X’ be the initial state of the system and ‘Y’ is the…
Show that for an ideal gas, the work differential dw is not an exact differential.
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…
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…