Phosphorus tribromide decomposes to form phosphorus and bromide, like this:

4pbr3(> p4(g)+6br2(g)

also, a chemist finds that a certain temperature at the equilibrium mixture of phosphorus tribromide, phosphorus, and bromine has the following composition:

compound pressure at equiibrium
pbr3 97.4 atm
p4 99.2 atm
br2 97.2 atm

calculate the value of the equilibrium constant kp for this reaction. round your answer to 2 significant digits.