## Chemistry and Chemical Reactivity (9th Edition)

From stoichiometry: a) $-\frac{\Delta[NO]}{2}=-\frac{\Delta[Br_2]}{1}=\frac{\Delta[NOBr]}{2}$ b) $-\frac{\Delta[N_2]}{1}=-\frac{\Delta[H_2]}{3}=\frac{\Delta[NH_3]}{2}$