At 60 °C, Kp = 0.052 for the reaction: PHBC| (s) -> <-
PH3 (g) + BC|3 (g)
A closed 1.500-L vessel at 60 °C is charged with 0.0500g of BC| (g); 3.00 g of solid PHBCl is then added to the flask, and the system is allowed to equilibrate. What is the equilibrium concentration of PH?