Assuming that you start with equal concentrations of PCl3 and Cl2 and no PCl5 is initially present, describe the relative abundance of each species present at equilibrium.
a) PCl3 and Cl2 will be present in equal amounts, while PCl5 will be absent.
b) PCl3 will be present in excess compared to Cl2, with PCl5 being produced as a product.
c) PCl3 will be fully consumed, resulting in excess Cl2 and the production of PCl5.
d) PCl5 will be present in excess, with PCl3 and Cl2 being consumed to produce it.