Q. 37

Although heat is a path function but heats absorbed by the system under certain specific conditions is independent of path. What are those conditions? Explain.

Answer :

Heat is independent of the path under 2 conditions:


1. When the volume of the system is kept constant-


By 1st law of thermodynamics:
q = ΔU + (-w)
and -w = pΔV


Therefore , q = ΔU + pΔV
ΔV = 0 (at constant volume)


Hence, qv = ΔU + 0 = ΔU= change in internal energy


2. When the pressure of the system is kept constant –


At constant pressure, qp= ΔU + pΔV


But , ΔU + pΔV = ∆H


Therefore , qp = ∆H = change in enthalpy.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Calorimetry - 02 | Mastering important conceptsCalorimetry - 02 | Mastering important conceptsCalorimetry - 02 | Mastering important concepts39 mins
Hess LawHess LawHess Law61 mins
Thermodynamics | Types of EnthalpyThermodynamics | Types of EnthalpyThermodynamics | Types of Enthalpy66 mins
Enthalpy & Heat Capacity | Interactive QuizEnthalpy & Heat Capacity | Interactive QuizEnthalpy & Heat Capacity | Interactive Quiz55 mins
An interesting lecture on EntropyAn interesting lecture on EntropyAn interesting lecture on Entropy63 mins
Heat Transfer - 01 | Mastering important conceptsHeat Transfer - 01 | Mastering important conceptsHeat Transfer - 01 | Mastering important concepts40 mins
Kinetic Theory of GasesKinetic Theory of GasesKinetic Theory of Gases46 mins
Interactive Quiz on Gibbs EnergyInteractive Quiz on Gibbs EnergyInteractive Quiz on Gibbs Energy55 mins
Bond Disassociation Enthalpy | Mastering important conceptsBond Disassociation Enthalpy | Mastering important conceptsBond Disassociation Enthalpy | Mastering important concepts45 mins
Calorimetry - 01 | Mastering important conceptsCalorimetry - 01 | Mastering important conceptsCalorimetry - 01 | Mastering important concepts45 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses