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## Which of the following would have the highest vapor pressure?

Thus at room temperature, the substance with the lowest boiling point will have the highest vapor pressure (easiest to get into the gas phase). The substance with the highest boiling point will have the lowest vapor pressure. Vapor pressure is a liquid property related to evaporation.

## How do you find the vapor pressure of a solution?

Raoult’s equation shows how to calculate the change in the vapor pressure of a solution from the vapor pressure of the pure solvent: Psolution = xsolventPsolvent, where Psolution is the resulting vapor pressure of the solution, xsolvent is the mole fraction of the solvent and Psolvent is the vapor pressure of the pure …

## Which of the solutions will have the lowest vapor pressure?

Which would have the lowest vapor pressure at 25 oC? The correct answer is c. All of the solutions have the same concentration, but when NaCl dissolves, it breaks into 2 particles. Glucose is a non-electrolyte and does not break apart.

## What is the vapor pressure of a solution?

The vapour pressure of a solution of a non-volatile solute is equal to the vapour pressure of the pure solvent at that temperature multiplied by its mole fraction. In this equation, Po is the vapour pressure of the pure solvent at a particular temperature.

## Why does a solution have a lower vapor pressure?

There are fewer solvent molecules on the surface of the solution than on the surface of the pure liquid. Fewer will vaporize and, as a consequence, the vapor pressure of the solution will be less than that of the pure liquid at the same temperature (see Figure 11.7b).

## What is the vapor pressure of water?

Examples

Substance Vapor pressure Temperature (°C)
(Pa)
Xenon difluoride 600 Pa 25
Water (H2O) 2.3 kPa 20
Propanol 2.4 kPa 20

## What is the vapor pressure of water at 30.0 OC?

Vapor Pressure of Water from 0 °C to 100 °C

T °C P (torr)
29 30.0
30 31.8
31 33.7
32 35.7

1 atmosphere

908.7641 mmHg

## What gives water its unique properties?

Summary. Water molecules are polar, so they form hydrogen bonds. This gives water unique properties, such as a relatively high boiling point, high specific heat, cohesion, adhesion and density.

## How do you find the boiling point of vapor pressure?

If the boiling point values for a specified substance at a specified BP temperature and pressure are given, one can determine the Boiling Point at different vapor pressure values using the Clausis-Clapeyron Equation. The Clausis-Clapeyron Equation is derived from VP2=VP1e−ΔHvRT at two different temperatures.

## What is the formula to find boiling point?

The amount by which the boiling point changes is directly proportional to the amount of solute added. The equation can further be written as, ΔTb=1000×Kb×wM×W where, ” is weight of the solute, ” is the molar mass of the solute and ‘W’ is the weight of the solvent in grams.

## What is the equilibrium vapor pressure of a liquid?

The vapor pressure or equilibrium vapor pressure is defined as the pressure exerted by a vapor that is in thermodynamic equilibrium with the condensed phase (solid or liquid) at a given temperature in a closed system. The equilibrium vapor pressure is an indication of the evaporation rate of a liquid.

## What is equilibrium vapor pressure of a liquid How is it measured?

The equilibrium vapor pressure is an indication of a liquid’s evaporation rate. It relates to the tendency of particles to escape from the liquid (or a solid). A substance with a high vapor pressure at normal temperatures is often referred to as volatile. Vapor pressure is measured in the standard units of pressure.

## What does the vapor pressure of a liquid depend on?

The vapor pressure of a liquid varies with its temperature, as the following graph shows for water. The line on the graph shows the boiling temperature for water. As the temperature of a liquid or solid increases its vapor pressure also increases. Conversely, vapor pressure decreases as the temperature decreases.

volatile

## What is the difference between the BP and NBP of a liquid?

“Normal boiling point” is a boiling point of a liquid at normal (standard) pressure and temperature, while “boiling point” is measured at any other conditions of pressure and temperature. “Normal boiling point” refers to 1 g of substance: “boiling point” refers to any other amount of substance.

2021-06-17