16.2 Exercise 12

Predict the sign of the entropy change for the following processes. Give a reason for your prediction.

(a) $\text{Na}^{+} \left(a q\right) + \text{Cl}^{−} \left(a q\right) \rightarrow \text{NaCl} \left(s\right)$

(b) $2 \text{Fe} \left(s\right) + \frac{3}{2} \text{O}_{2} \left(g\right) \rightarrow \text{Fe}_{2} \text{O}_{2} \left(s\right)$

(c) $2 \text{C}_{6} \text{H}_{14} \left(l\right) + 19 \text{O}_{2} \left(g\right) \rightarrow 14 \text{H}_{2} \text{O} \left(g\right) + 12 \text{CO}_{2} \left(g\right)$