Three samples of gas each exert 740. mm hg in separate 2 l containers. what pressure do they exert if they are all placed in a single 2 l container

According to Dalton's law of partial pressure, the total pressure exerted is simply equal to the sum of the partial pressures of the individual gases. Given that all three samples of gas each exert 740 mmHg, when they are placed in a single 2 L container, they exert a pressure of 2220 mmHg on the container which is the sum of their individual pressures. 

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