Abottle is half-filled with a 50: 50 (mole-to-mole) mixture of n-heptane (c7h16) and n-octane (c8h18) at 25â°c. what is the mole ratio of heptane vapor to octane vapor in the air space above the liquid in the bottle? the vapor pressures of heptane and octane at 25â°c are 31 torr and 11 torr, respectively.
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