Molecular Mass Calculator by Christoph Gohlke

Hill notation: H2O

Average mass: 18.01528

Monoisotopic mass: 18.01056

Nominal mass: 18

Elemental Composition

Element Number Relative mass Fraction %
H 2 2.01588 11.1898
O 1 15.99940 88.8102
Total 3 18.01528 100.0000

Mass Distribution

Most abundant mass: 18.01056 (99.734%)

Mean mass: 18.01529

Relative mass Fraction % Intensity
18.01056 99.734057 100.000000
19.01556 0.060933 0.061095
20.01481 0.204963 0.205509
21.02109 0.000047 0.000047
22.02736 0.000000 0.000000