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There are three puddles of different sizes on a sidewalk:
a small puddle of rainwater
a medium-sized puddle of spilled hot water
a large puddle of spilled cold water
Which puddle has the highest vapor pressure and why?
The puddle has the highest vapor pressure because vapor pressure depends on .

The evaporation of water is a clear example of phase change from liquid to gas. The chemicals potentials for both phases α (liquid) and β (vapor) are functions dependig of the temperature (T) and the pressure (P) and they have the same value.

μα(T,P) = μβ(T,P)

Based in that assumption is that the equation of Clausius Clapeyron:

Ln Pv = - L/(RT) +C

Being Pv, the vapor pressure. L the vapor entalpy and R the gas constant.

So, the vapor pressure is a mere function of the temperature, thus if the temperature rises, the vapor pressure increases.

With that said, the puddle of hot water, has more temperature and thus, a higher vapor pressure.

Hope it helped!

arjunrv arjunrv · Answer 2 · 2019-09-05T13:07:51+02:00

The medium sized puddle of spilled hot water has the highest vapor pressure because vapor pressure depends on temperature of the object.

Answer: B

Explanation

Vapor pressure, the pressure of vapor molecules of liquid exerting on the liquid surface.

It helps to determine the evaporation rate, the more the vapor pressure the more rate of evaporation will occur.

This is because the vapor pressure is the quantification of vapor molecules of the liquid on the surface of the liquid on giving an external force like heat.

The vapor pressure depends on liquid temperature and liquid surface area and pressure.

So in the given case, rainwater puddle has small surface area and room temperature, spilled hot water puddle has higher surface area as well as temperature compared to rain water puddle.

Even though the cold water puddle has large surface area but the temperature of cold water is very less compared to the temperature of hot water, so it makes the medium sized hot water puddle the one with the highest vapor pressure as the vapor pressure depends on temperature of the liquid.