Exact mass

{
  "id": "MLC-T-CHM-004142",
  "term": "Exact mass",
  "field": "Chemistry",
  "definition": "The mass of an ion calculated using the exact masses of its constituent isotopes, rather than the average atomic weights. This value is highly specific to a particular elemental composition and isotopic distribution. It is used in high-resolution mass spectrometry to determine the elemental formula of a compound with high precision.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "accurate mass"
  ],
  "references": [
    "PAC, 2013, 85, 1515. 'Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)' on page 1542 (https://doi.org/10.1351/PAC-REC-06-04-06)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/exact-mass/"
}