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Two separate flasks are each filled with a gas at 25.0°C; the valve between them is opened and the gases are allowed to mix. What would be the final pressure in torr after mixing, if initially C3H8 is in the first flask (Volume = 4.000 L) at 371.4 torr and H2S is in the second flask (Volume = 2.000 L) at 265.9 torr?

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