Chapter 16, Problem 36QAP

Oxygen can be made in the laboratory by reacting sodium peroxide and water.

$2{\text{Na}}_2{\text{O}}_2\left(s\right)+2{\text{H}}_2\text{O}\left(l\right)\to 4\text{NaOH}\left(s\right)+{\text{O}}_2\left(g\right)$

$\Delta H°=-109.0\text{kJ};\Delta G°=-148.4\text{kJ}$ at 25°C

(a) Calculate ΔS° the sign reasonable?

(b) Calculate S° for Na₂O₂(s).

(c) Calculate $\Delta H_{\text{f}}^{°}$ for Na₂O₂(s).