Problem Explication Group #3 Amber Gipson Erin Key Kelly Lee Amy Ozley
#64 Calculate ∆H° for each of the following reactions using the data in Appendix 4: 4Na (s) + O 2(g) 2Na 2 O (s) 2Na (s) +2H 2 O (l) 2NaOH (aq) + H 2(g) 2Na (s) + CO 2(g) NA 2 O (s) + CO (g) Explain why a water or carbon dioxide fire extinguisher might not be effective in putting out a sodium fire.
Equation: *Product - Reactant = ΔH* 4Na (s) + O 2(g) 2Na 2 O (s) 4 (0) + 0 2(-416) -832 – 0 ΔH= -832 EXOTHERMIC!
Equation: *Product - Reactant = ΔH* 2Na (s) +2H 2 O (l) 2NaOH (aq) + H 2(g) 0 + 2(-286) 2(-470) (-572) ΔH= -368 EXOTHERMIC!
Equation: *Product - Reactant = ΔH* 2Na (s) + CO 2(g) NA 2 O (s) + CO (g) 2 (0) ΔH= EXOTHERMIC!
Answer: The reaction of water and sodium release heat. The reaction of carbon dioxide and sodium release heat also. They are both exothermic reactions.