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Vapour Pressure Formula

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Vapour Pressure of Solution is the pressure of the vapor which is formed after a solid get dissolves into the liquid. Check FAQs

P s = χ s \cdot P′ s

P_s - Vapour Pressure of Solution?χ_s - Mole Fraction of Solvent in Solution?P′_s - Vapour Pressure of Solvent?

Vapour Pressure Example

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Here is how the Vapour Pressure equation looks like with Values.

Here is how the Vapour Pressure equation looks like with Units.

Here is how the Vapour Pressure equation looks like.

25470 = 0.9 \cdot 28300

25470Pa = 0.9 \cdot 28300Pa

25470 = 0.9 \cdot 28300

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Vapour Pressure Solution

Follow our step by step solution on how to calculate Vapour Pressure?

FIRST Step Consider the formula

P s = χ s \cdot P′ s

Next Step Substitute values of Variables

∴

P s = 0.9 \cdot 28300Pa

Next Step Prepare to Evaluate

∴

P s = 0.9 \cdot 28300

LAST Step Evaluate

∴

P s = 25470Pa

Vapour Pressure Formula Elements

Variables

Vapour Pressure of Solution

Vapour Pressure of Solution is the pressure of the vapor which is formed after a solid get dissolves into the liquid.

Symbol: P_s

Measurement: PressureUnit: Pa

Note: Value should be greater than 0.

Formulas to find Vapour Pressure of Solution

Mole Fraction of Solvent in Solution

Mole Fraction of Solvent in Solution is the concentration of solvent in the solution.

Symbol: χ_s

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Mole Fraction of Solvent in Solution

Vapour Pressure of Solvent

Vapour Pressure of Solvent is the pressure of the vapour which is formed before a solid get dissolves into the liquid.

Symbol: P′_s

Measurement: PressureUnit: Pa

Note: Value can be positive or negative.

Formulas to find Vapour Pressure of Solvent

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How to Evaluate Vapour Pressure?

Vapour Pressure evaluator uses Vapour Pressure of Solution = Mole Fraction of Solvent in Solution*Vapour Pressure of Solvent to evaluate the Vapour Pressure of Solution, Vapour Pressure refers to the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. Vapour Pressure of Solution is denoted by P_s symbol.

How to evaluate Vapour Pressure using this online evaluator? To use this online evaluator for Vapour Pressure, enter Mole Fraction of Solvent in Solution (χ_s) & Vapour Pressure of Solvent (P′_s) and hit the calculate button.

FAQs on Vapour Pressure

What is the formula to find Vapour Pressure?

The formula of Vapour Pressure is expressed as Vapour Pressure of Solution = Mole Fraction of Solvent in Solution*Vapour Pressure of Solvent. Here is an example- 25470 = 0.9*28300.

How to calculate Vapour Pressure?

With Mole Fraction of Solvent in Solution (χ_s) & Vapour Pressure of Solvent (P′_s) we can find Vapour Pressure using the formula - Vapour Pressure of Solution = Mole Fraction of Solvent in Solution*Vapour Pressure of Solvent.

Can the Vapour Pressure be negative?

No, the Vapour Pressure, measured in Pressure cannot be negative.

Which unit is used to measure Vapour Pressure?

Vapour Pressure is usually measured using the Pascal[Pa] for Pressure. Kilopascal[Pa], Bar[Pa], Pound Per Square Inch[Pa] are the few other units in which Vapour Pressure can be measured.

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