Anzieletowinfordgo Anzieletowinfordgo Chemistry Answered 33 () ⇌ 3() + 3() = 0.052 at 60 °C.a. Calculate Kcb. After 3.00 g of solid PH3BCl3 is added to a closed .500-L vessel at 60.0 °C, the vessel is charged with 0.00043 mol of BCl3(g). What is the equilibrium concentration of PH3?