What will be the total vapor pressure in torr of a solution, Ask an Expert

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Pentane (C5H12) and heptane (C7H16) are two hydrocarbon liquids present in gasoline. At 20 °C, the vapor pressure of pentane is 422 torr and the vapor pressure of heptane is 36.0 torr. What will be the total vapor pressure (in torr) of a solution prepared by mixing equal masses of the two liquids?

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