35. Phosphorous pentachloride decomposes to phosphorous trichloride according to this equation: PCI, (g) →→ PC1₂(g) + Cl₂(g). At equilibrium, [PC] = 1.00 M and [Cl₂] = 3.16 x 10-2 M. Show your work. A. Write the expression for determining the concentration of PC1₂. B. What is the equilibrium concentration of PC13? Use: Keq = 1.00 × 10-³.