Phosphorus and bromine react to form phosphorus tribromide, like this: P4(9) + 6 Br,(g) 4 PB13(g) Also, a chemist finds that at a certain temperature the equilibrium mixture of phosphorus, bromine, and phosphorus tribromide has the following composition: compound pressure at equilibrium P4 45.7 atm Br, 22.6 atm PB13 81.5 atm Calculate the value of the equilibrium constant K, for this reaction. Round your answer to 2 significant digits.

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