Today we started a new section on ChemCalc website: the exercises. The goal is to add various kinds of exercises dealing with molecular formulae, monoisotopic mass and isotopic distribution.

Example of webservcie integration in python, javascript, R to find MF from monoisotopic mass.

Find possible molecular formula from a monoisotopic mass, a range of molecular formula and ionizations mode.

Explore the list of atomic elements with their masses and isotopes on ChemCalc.

List of atomic elements with their mass and isotopes mass.

You entered: C4 H5 N O S2 The formula is: C 4 H 5 NOS 2 Molecular weight: 147.2098 Monoisotopic mass: 146.981254 Elemental analysis of C 4 H 5 NOS 2:

You entered: C6H11O9MgP The formula is: C 6 H 11 MgO 9 P Molecular weight: 282.4267 Monoisotopic mass: 281.999114 Elemental analysis of C 6 H 11 MgO 9 P:

You entered: C18H11BrO The formula is: C 18 H 11 BrO Molecular weight: 323.18874 Monoisotopic mass: 321.999326 Elemental analysis of C 18 H 11 BrO:

You entered: C9H19O2BS The formula is: C 9 H 19 BO 2 S Molecular weight: 202.11866 Monoisotopic mass: 202.11988 Elemental analysis of C 9 H 19 BO 2 S:

You entered: C19H34NCl The formula is: C 19 H 34 ClN Molecular weight: 311.93866 Monoisotopic mass: 311.237976 Elemental analysis of C 19 H 34 ClN: