Question

Hen the external pressure is 404 kPa, what is the vapor pressure of water at its boiling point?

Answer 1

At the boiling point, external pressure is equal to the vapor pressure of water. Therefore, the vapor pressure of water at an ecternal pressure of 404 kPa is equal to 404 kPa as well. Hope this answers the question. Have a nice day. Feel free to ask more questions.

Answer 2

Answer:

Vapor pressure is 404kPa

Explanation:

Before proceeding, it is important to understand the  terms (External pressure, Vapour Pressure and boiling point) and their relationship.

Vapor Pressure is defined as pressure of a vapour from a liquid at its surface.

Atmospheric (external) pressure is the sum of pressures of all the gas components, including the vapor pressure of the liquid. This is a description of Dalton's law.

How are both pressures then related to boiling?

When vapor pressure is the same as the external pressure then a liquid is deemed to be Boiling.

This means that the Vapour pressure is also 404kPa.