Phosphorus pentachloride decomposes according to the chemical equation   PCl5(g)↽−−⇀PCl3(g)+Cl2(g)?c=1.80 at 250 ∘C A 0.3388 mol sample of PCl5(g) is injected into an empty 4.40 L reaction vessel held at 250 ∘C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium. [PCl5]= ____________M [PCl3]= ____________M

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