(a) What is the vapor pressure of water at 20.0^∘ C ? (b) What percentage of atmospheric pressur

step 1 Alright, let's do part A. The vapor pressure of water at 20 degree centigrade is given directly

(a) What is the vapor pressure of water at 20.0^∘ C ? (b)...

(a) What is the vapor pressure of water at $20.0^{\circ} \mathrm{C}$ ? (b) What percentage of atmospheric pressure does this correspond to? (c) What percent of $20.0^{\circ} \mathrm{C}$ air is water vapor if it has $100 \%$ relative humidity? (The density of dry air at $\left.20.0^{\circ} \mathrm{C} \text { is } 1.20 \mathrm{kg} / \mathrm{m}^{3} .\right)$

Key Concepts

Atmospheric Pressure

Atmospheric pressure is the pressure exerted by the weight of the Earth's atmosphere on a unit area. It serves as a baseline in many calculations, particularly in comparing the vapor pressure of a substance to the overall pressure of the surrounding air, which is important in understanding gas-phase equilibria and environmental conditions.

Vapor Pressure

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid (or solid) phase at a given temperature. It is determined solely by the temperature and the nature of the substance, and it increases with rising temperature. This concept is fundamental in understanding phase transitions and in calculations involving evaporation and condensation.

Relative Humidity

Relative humidity is the ratio of the actual partial pressure of water vapor present in the air to the equilibrium vapor pressure of water at the same temperature, expressed as a percentage. It indicates how close the air is to being saturated with water vapor, affecting weather, human comfort, and various physical processes.

Partial Pressure and Gas Mixtures

Partial pressure refers to the pressure contributed by an individual gas within a mixture, assuming it occupies the entire volume alone. In a mixture of gases, the total pressure is the sum of the individual partial pressures (as described by Dalton's Law), a concept that is crucial when analyzing the composition of air and understanding the presence and behavior of water vapor within it.

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