Areaction of hydrogen gas and bromine gas forms hydrogen bromide gas. 0.1 mol h2 (g) y. and and 0.1 mol brz (g) are placed together in a 3.0 l flask and heated to 700 k. no hydrogen bromide is present initially. what is the concentration of each substance in the flask at equilibrium if keq 64 at 700 k? 10) a hydrogen iodide gas (hi) can decompose to form hydrogen gas and iodine gas. for this system, if we start with 0.010 mol/l of h2 and l2 and 0.096 mol/l of hi, what will the concentrations of each species be at equilibrium given that keq 0.016?