Question

At equilibrium at 75°C, a 3.0L flask contains:

4.5 mol PCIs 2.4 mol H20 1.2 mol HCI 1.5 mol of POCI 3

Answer 1

at equilibrium, the concentrations of the four species in the flask are:

[PCI5] = [HCl] = 1.10 M

[H2O] = 0.73 M

[HCl] = 0.37 M

Note that the units for the concentrations are in M (molarity).