CH.3 Atoms, molecules and stoichiometry Flashcards
1
Q
Unified atomic mass unit
A
one twelfth of the mass of a carbon-12 atoms
2
Q
Relative atomic mass Ar
A
the weighted average mass of atoms in a given sample of an element compared to the value of the unified atomic mass unit
3
Q
Relative molecular mass Mr
A
the weighted average mass of a molecule in a given sample of that molecule compared to the value of the unified atomic mass unit
4
Q
Relative formula mass Mr
A
the weighted average mass of one formula unit compared to the value of the unified atomic mass unit
5
Q
Relative isotopic mass
A
the mass of a particular atom of an isotope compared to the value of the unified atomic mass unit
