Question

calculate the concentration of PCl5 (g) and PCl 3 (g) at equilibrium.

Phosphorus pentachloride decomposes according to the chemical equation PCI,() PCI,() + C(®) 1.80 at 250 °C K A 0.131 mol sample of PCI,(g) is injected into an empty 2.05 L reaction vessel held at 250 'C Calculate the concentrations of PCI,(g) and PCI,(g) at equilibrium. M PCI,I Mi PCI,J

Answer 1

Given equilibrium is per pc, (G) + Cl (s) kes1.8 Given that 0.13 1 mole of pay present in 2.054 of reachon vessel. 0.131 moles = 0.0639 M (pales] 2.057 T peles 0.0639 Paz + c 0 0 Initial ta ta change -a 0.0639-x Equilibrium (pel₃] [c2] Kc = - ppcll 2x 1.8 = = 0.0639.2 (0.0639-x) 1.8 - an ar -1.82 0.115 +1.82-0.115=0 x = 0.0618M :. (pc) = 0.0618 M & LC₂] = 0.06189

[PCl_{​​​​5}]_e = 0.0639-0.0618 = 0.0021 M

[PCl_{​​​​3}​​​]_e = 0.0618 M