Question

$\Delta S_{Total}=-40kJ/mol\times K$
$\Delta H_{sys}=2000kJ/mol$
$T=400K$
Find out value of $\Delta S_{system}$ at equilibrium ?

• A. $-35kJ/mol\times K$
• B. $-5kJ/mol\times K$
• C. $-20kJ/mol\times K$
• D. $-10kJ/mol\times K$

Answer 1

The correct option is B $-5kJ/mol\times K$

$\Delta S_{system}$ at equilibrium $=\frac{\Delta H_{system}}{T}[\Delta G=0]$

$=\frac{2000}{400}$ $kJ/mol\times K$

$=5$ $kJ/mol\times K$