mole fraction
Quick Summary
Mole fraction is a way to express the composition of a mixture, such as a solution. It is defined as the ratio of the number of moles of one component to the total number of moles of all components in the mixture. For example, in a mixture of two components, the mole fraction of component 1 (x1) and component 2 (x2) add up to 1 (x1 + x2 = 1).12
A mole itself is a standard scientific unit used to measure large quantities of very small particles like atoms or molecules. It represents a specific, large number of units: 6.02214076 × 1023, known as Avogadro's number. This concept is fundamental in chemistry for understanding chemical reactions and calculating the amounts of substances involved.3
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