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A 45 g sample of an unidenti?ed gas is allowed to reach equilibrium in a closed 10 L container at 27?C. The equilibrium pressure is measured as 0.8 atm. What is the molecular weight of the gas? 1. 138.5 g · mol?1 2. 12.5 g · mol?1 3. 3.6 g · mol?1 4. 45 g · mol?

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