When exposed to UV light, phosgene (COCL2) decomposes according to the reaction COCL2(g)->CO(g) + Cl2(g). All the air is removed from a flask. The flask is then filled with phosgene to a pressure of 2.8 atm and then exposed to UV light. If the temperature remains constant during the decomposition, what is the partial pressure of Cl2 (g) in the flask after the decomposition is complete, assuming 100% yield?

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