A mixture of 10% C6H6 vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around _______________ °C?
Correct answer: D. 18.7
- A. 21.7
- B. 20
- C. 27.3
- D. 18.7
Explanation
At the original dew point, benzene's partial pressure is approximately its saturation pressure at 20°C, or 75 mm Hg. At 700 mm Hg total pressure, its partial pressure becomes 70 mm Hg, corresponding to a benzene dew point of about 18.7°C.
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