Question

When one mole of univalent salt AB is dissolved in water at $300K$, $3.7kJ$ of heat is absorbed and $△G$ of the process is $-8.3kJ$. What is the value of $△S$ for the process?

• A. $40J{K}^{-1}$
• B. $30J{K}^{-1}$
• C. $20J{K}^{-1}$
• D. $-15.3J{K}^{-1}$

Answer 1

The correct option is A $40J{K}^{-1}$

Given :
$T=300K,△H=3.7kJ△G=-8.3kJ$
To calculate $△S=?$
We know,
$△G=△H-T△S$
putting values
$\Rightarrow -8.3=3.7-300\times △S$
$\Rightarrow △S=0.04kJ{K}^{-1}$
$=40J{K}^{-1}$