Question

the boiling point of water at 1 atm is 100°c and the boiling point of ethanol at the same pressure is 78°c. which one has the higher vapour pressure at a particular temperature? select one: ethanol water they will have the same vapour pressure clear my choice

Explanation:

Vapour pressure and boiling point are inversely related. A substance with a lower boiling point (like ethanol, 78°C) reaches its boiling point (vapour pressure = atmospheric pressure, 1 atm) at a lower temperature. At a particular temperature, a substance with a lower boiling point has higher vapour pressure because it is more volatile (easier to vaporize). Ethanol has a lower boiling point than water (100°C), so ethanol has higher vapour pressure at a particular temperature.

Answer:

A. Ethanol