Consider the equilibrium 2 PCl_3(g) + O_2(g) 2 POCl_3(g) for which at a certain…
CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
Consider the equilibrium
2PCl3(g)+O2(g)⇌2POCl3(g)
for which Kc=3.0×103 at a certain temperature. A sealed 1.0 L vessel initially contains 1.0 mol PCl3, 4.0 mol O2, and 0.50 mol POCl3. Without performing detailed calculations, which species will have the highest concentration once equilibrium is re-established at this temperature?
(a) POCl3
(b) All three species will be present in roughly equal concentrations
(c) O2
(d) PCl3