Molar Masses of Compounds
The molar mass of a compound is given by the sum of the standard atomic weights of the atoms which form the compound multiplied by the molar mass constant, M
u:
- M(NaCl) = × 1 g/mol = 58.443(2) g/mol
- M(C
12H
22O
11) = ( + + ) × 1 g/mol = 342.297(14) g/mol.
An average molar mass may be defined for mixtures of compounds. This is particularly important in polymer science, where different polymer molecules may contain different numbers of monomer units (non-uniform polymers).
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