Chapter 16, Problem 5QAP

On the basis of your experience, predict which reactions are spontaneous:

(a) ${\text{PbO}}_2\left(s\right)\to \text{Pb}\left(s\right)+{\text{O}}_2\left(g\right)$(b) ${\text{N}}_2\left(l\right)\to {\text{N}}_2\left(g\right)$ at 25°C

(c) ${\text{C}}_6{\text{H}}_{12}{\text{O}}_6\left(s\right)\to {\text{C}}_6{\text{H}}_{12}{\text{O}}_6\left(l\right)$ at 25°C

(d) ${\text{Ca}}^{2+}\left(aq\right)+{\text{CO}}_3{}^{2-}\left(aq\right)\to {\text{CaCO}}_3\left(s\right)$