Chapter 9, Problem 9.63SP

Indicate the direction of heat transfer between the system and the surroundings, classify the following processes as endo- or exothermic, and give the sign of $\Delta H°$ .

(a) ${\text{N}}_{\text{2}}\text{(g)}+{\text{O}}_2(g)\to \text{2NO(g)}$  $\Delta H°$ = +182.6 kJ

(b) $\text{2}{H}_{2}O\left(g\right)\to 2H_2(g)+{\text{O}}_{\text{2}}(g)$  $\Delta H°$= +483.6 kJ

(c) ${\text{H}}_{\text{2}}\text{(g)}+C{l}_2(g)\to 2HCl(g)$  $\Delta H°$= -184.6 kJ