Question

The boiling points of water and 2-methyl-2-propanol are 100 °c and 82.2 °c respectively. which liquid has a lower vapor pressure at a given temperature?

Answer 1

The liquid with the higher boiling point, which is water, has a lower vapor pressure at a given temperature compared to 2-methyl-2-propanol.

Step-by-step explanation:

The question asks which liquid between water (boiling point at 100 °C) and 2-methyl-2-propanol (boiling point at 82.2 °C) has a lower vapor pressure at a given temperature. Intuitively, the substance with the higher boiling point, in this case, water, will have the lower vapor pressure at any given temperature because it requires more heat energy to convert it into a gas. This can be related to the strength of intermolecular forces within the liquid. Water, due to its ability to form strong hydrogen bonds, has lower vapor pressure compared to 2-methyl-2-propanol, which has weaker intermolecular forces.

Answer 2

When a liquid is boiled, the vapour pressure exerted by that liquid increases with increasing temperature. As the vapour pressure of that liquid becomes equal to the surrounding pressure, then vaporization occurs.

Since in this case, the propanol has a lower boiling point, therefore this means that it has higher vapour pressure at this pressure than water.

SO the liquid with lower vapour pressure is water.

Answer:

water