Vapour pressure of water is 4.579 torr at 0°C and 9.209 torr at 10°C, so increase in vapour pressure from 0°C to 10°C is 4.630 torr. What will be the change in vapour pressure from 90°C to 100°C?
Correct answer: B. >4.630 torrs
- A. 4.63 torr
- B. >4.630 torrs
- C. <4.73 torr
- D. 47.07
Explanation
The increase is from 527.8 torr to 760 torr when temperature changes from 90°C to 100°C. Mentioned on page 90 of punjab book and on page 128 on its e-book under vapour pressure increases with temperature.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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