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SO2Cl2 decomposes in the gas phase by the reaction SO2Cl2(g) → SO2(g) + Cl2(g). The reaction is first order in SO2Cl2 and the rate constant is 3.0 × 10-6 s-1 at 600 K. A vessel is charged with 2.4 atm of SO2Cl2 at 600 K. The partial pressure of SO2Cl2 at 3.0 × 105 s is ________ atm.