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The Amount of Water

Last updated

Mar 8, 2023
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Chemists use the mole so often to measure how much of a substance is present that it is convenient to have a name for the quantity which this unit measures. In the International System this quantity is called the amount of substance and is given the symbol n. Here again a common English word has been given a very specific scientific meaning. Although amount might refer to volume or mass in everyday speech, in chemistry it does not.

When a chemist asks what amount of H₂O was added to a test tube, an answer like “0.0678 mol H₂O” is expected. This would indicate that 0.0678 × 6.022 × 10²³ or 4.08 × 10²², H₂O molecules had been added to the test tube.

From ChemPRIME: 2.8: The Amount of Substance

Contributors and Attributions

Ed Vitz (Kutztown University), John W. Moore (UW-Madison), Justin Shorb (Hope College), Xavier Prat-Resina (University of Minnesota Rochester), Tim Wendorff, and Adam Hahn.

Contributors and Attributions

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