Which of the following conditions are not suitable for a spontaneous reaction?
Which of the following conditions are not suitable for a spontaneous reaction?
$\Delta H < 0$ and $\Delta S>0$ at low temperature.
$\Delta H < 0$ and $\Delta S < 0$ at high temperature.
$\Delta H > 0$ and $\Delta S < 0$ at low temperature.
$\Delta H>0$ and $\Delta S>0$ at high temperature.
Solution
$\Delta G$ (Gibbs' free energy) must be negative for a spontaneous reaction.
Using Gibbs' free energy equation, we can find favourable conditions.
$\Delta G=\Delta H-T \Delta S\left[\begin{array}{l}\Delta H=\text { Change in enthalpy } \\ \Delta S=\text { Change in entropy } \\ T=\text { Temperature }\end{array}ight]$
