Enter the mole fraction of the solvent and the vapor pressure of the solvent (Pa) into the calculator to determine the Saturation Pressure.

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## Saturation Pressure Formula

The following formula is used to calculate the Saturation Pressure.

**Psat = Xsolv * Psolv**

- Where Psat is the Saturation Pressure (Pa)
- Xsolv is the mole fraction of the solvent
- Psolv is the vapor pressure of the solvent (Pa)

## How to Calculate Saturation Pressure?

The following two example problems outline how to calculate the Saturation Pressure.

**Example Problem #1:**

- First, determine the mole fraction of the solvent. In this example, the mole fraction of the solvent is given as .87.
- Next, determine the vapor pressure of the solvent (Pa). For this problem, the vapor pressure of the solvent (Pa) is given as 100.
- Finally, calculate the Saturation Pressure using the equation above:

Psat = Xsolv * Psolv

Inserting the values from above and solving the equation:

Psat = .87 * 100 = 87 (Pa)

**Example Problem #2: **

Using the same process as above, first define the variables required by the formula. In this case, these values are:

mole fraction of the solvent = .75

vapor pressure of the solvent (Pa) = 200

Entering these values yields:

Psat = .75 * 200** = 150**(Pa)