Heptane c7h16 and octane c8h18 are constituents of gasoline, Ask an Expert

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Heptane (C7H16) and octane (C8H18) are constituents of gasoline. At 80.0 ?C, the vapor pressure of heptane is 428 mmHg and the vapor pressure of octane is 175 mmHg. What is Xheptane in a mixture of heptane and octane that has a vapor pressure of 307mmHg at 80.0 ?C?

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