Question

Determine whether the following reaction is spontaneous underd conditions. 2H₂O (I) +O₂ (g) → 2H₂O₂ (I) ΔH° = +196 kJ, ΔS° = -126 J K⁻¹ Does it have a cross-over temperature? (Non-spontaneous, no)

Answer 1

Explanation:

Since we know that the Gib's free energy for the reaction is given by

$\Delta G^{0} = \Delta H^{0} -T\Delta S^{0}$

For the reaction to be spontaneous the Gib's free energy must be negative.

It is already given that ΔH° is positive and ΔS° is negative.

So, Gib's free energy  is positive for all the temperature greater than zero degree Celsius.

So,given reaction is non-spontaneous.

No, there is no cross over temperature.