A solution is 40.0% by volume benzene (C6H6) in carbon tetrachloride at 20°C. The vapor pressure of pure benzene at this temperature is 74.61 mmHg and its density is 0.87865 g/cm3; the vapor pressure of pure carbon tetrachloride is 91.32 mmHg and its density is 1.5940 g/cm3. If this solution is ideal, its total vapor pressure at 20°C is
A) 84.64 mmHg.
B) 84.30 mmHg.
C) 82.96 mmHg.
D) 81.63 mmHg.
E) 165.93 mmHg.
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