The decomposition reaction takes place at 300K ( = 377). If the concentration of bromine gas at equilibrium is .2 mM, what was the equilibrium concentration of BrCl?
Initially, the concentration of bromine gas is 0. Therefore, any bromine gas present comes from the decomposition of BrCl. 2 moles of BrCl create 1 mole of . Additionally, note the equilibrium concentration of BrCl as represented in equation
(8). Since the concentration of bromine gas has increased by .2 mM and 2 moles of BrCl produce 1 mole of the concentration of BrCl must have decreased by twice the increase in concentration of . Also, bromine gas and chlorine gas must be present in the same concentration. Let x represent the initial concentration of BrCl.
