High Quality Content by WIKIPEDIA articles! In chemistry, mole fraction x is a way of expressing the composition of a mixture. The mole fraction of each component i is defined as its amount of substance ni divided by the total amount of substance in the system, n. The sum is over all components, including the solvent in the case of a chemical solution. As an example, if a mixture is obtained by dissolving 10 moles of sucrose in 90 moles of water, the mole fraction of sucrose in that mixture is 0.1.

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