What is entropy?
Entropy is a thermodynamic state function that measures the degree of randomness or disorder in a system.
It is denoted by the symbol $S$.
For a reversible process,the change in entropy $(dS)$ is defined as the ratio of heat absorbed reversibly $(dq_{rev})$ to the absolute temperature $(T)$:
$dS = \frac{dq_{rev}}{T}$.
The unit of entropy is $J \ K^{-1} \ mol^{-1}$.
It is denoted by the symbol $S$.
For a reversible process,the change in entropy $(dS)$ is defined as the ratio of heat absorbed reversibly $(dq_{rev})$ to the absolute temperature $(T)$:
$dS = \frac{dq_{rev}}{T}$.
The unit of entropy is $J \ K^{-1} \ mol^{-1}$.
Explore More
Similar Questions
In which of the following reactions,standard reaction entropy change $(\Delta S^o)$ is positive and standard Gibb's energy change $(\Delta G^o)$ decreases sharply with increasing temperature?
DifficultAIPMT 2012
View SolutionOne mole of an ideal gas at $350 \, K$ is in a $2.0 \, L$ vessel with thermally conducting walls,which are in contact with the surroundings. It undergoes isothermal expansion from $2.0 \, L$ to $3.0 \, L$ against a constant external pressure of $4 \, atm$. The change in entropy of the surroundings $(\Delta S_{surr})$ is $...... \, J \, K^{-1}$ (Nearest integer). Given: $R = 8.314 \, J \, K^{-1} \, mol^{-1}$.
Among the following processes,for which process is the change in entropy $(\Delta S)$ negative?
Which state functions are required to understand the second law of thermodynamics?
Easy
View SolutionWhy does the entropy of a substance increase with an increase in temperature?
Easy
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo