CHMA10H3 Lecture Notes - Lecture 7: Mass Spectrum, Chemical Formula, Covalent Bond

• School: UTSC
• Department: Chemistry
• Course: CHMA10H3
• Professor: Andrew Petter

Document Summary

Chma10h3 - introductory to chemistry i: structure and bonding lecture 7: mass. High-resolution mass spectrometry: high-resolution mass spectrometry of a pure molecular substance gives an accurate value of the value of the relative mass of molecules with various isotopic composition to seven decimal places. Isotopologues are molecules that are identical except that their atoms have different isotopic compost ion: ex. 12c16o, 12c18o, 13c18o, are all carbon monoxide, co: a molecular ion is formed by ejection of one electron in which case the charge, z, is 1. In this case, the measured value m/z corresponds to the mass of the entire molecule. If molecules have the same formula (same atoms) but different connectivity pattern they are called constitutional or structural isomers: example: ethanol and dimethyl either have the same molecular formula, c2h60, but they are different compounds.