Which of the following reactions will have a positive entropy value?
a. 4Fe(s)+3O₂(g)→2Fe₂O₃(s)
b. 2C₆H₁₄(I)+19O₂(g)→14H₂O(g)+12CO₂(g)
c. Na⁺(aq)+CI⁻(aq)→NacI(s)