The value of is — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

For the total mixture, $\Delta G_{\text{total}} = 3 \text{ moles} \times (-380 \text{ cal/mol}) = -1140 \text{ cal}$. Since $\Delta H_{\text{mix}} = 0$, $\Delta G = -T\Delta S$. Thus, $\Delta S_{\text{total}} = -\frac{\Delta G}{T} = \frac{1140}{300} = +3.8 \text{ cal/K}$. Therefore, correct answer is B.