Chapter 9, Problem 75E

Calculate $\text{ΔH°}$ for each of the following reactions using the data in Appendix $4$ :

$\text{4Na(s)}\text{+}{\text{O}}_{\text{2}}\text{(g)}\to {\text{2Na}}_{\text{2}}\text{O (s)}$

$\text{2Na(s)}\text{+}2{\text{H}}_{\text{2}}\text{O(l)}\to \text{2NaOH (aq)}\text{+}{\text{H}}_{\text{2}}\text{(g)}$

$\text{2Na(s)}\text{+}{\text{CO}}_{\text{2}}\text{(g)}\to {\text{Na}}_{\text{2}}\text{O(s)}\text{+}\text{CO(g)}$

Explain why a water or carbon dioxide fire extinguisher might not be effective in putting out a sodium fire.