Enter the mole fraction in the vapor and the mole fraction in the liquid into the calculator to determine the K Value.

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## K Value Formula

The following formula is used to calculate a k value.

K = y / x

- Where K is the K value, or vapor-liquid equilibrium ratio.
- y is the mole fraction in the vapor
- x is the mole fraction in the liquid

## K Value Definition

The K Value is most often called the vapor-liquid equilibrium constant. It’s a ratio of the mole fraction in a vapor to the mole fraction in a liquid of a vapor to liquid transition or state. This value is derived from Henry’s Law and is sometimes called Henry’s constant.

## Can K values be negative?

In chemistry, as the formula above is used for, k values cannot be negative since you cannot have a negative mole fraction of a substance.

## K Value Example

how to calculate k value?

**First, determine the mole fraction in the vapor.**Determine the mole fraction of the molecule in a vapor state.

**Next, determine the mole fraction in the liquid.**Calculate the mole fraction of the molecule in a liquid state.

**Finally, calculate the K Value.**Calculate the K value using the formula above.

## FAQ

**What is a mole fraction?**

A mole fraction is the ratio of the number of moles of one component of a solution to the total moles of all components.

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