A chemical compound is a chemical combination of atoms. Each
chemical compound has a fixed ratio of elements. For example, the chemical
called Propane is written as C3H8. It will always have 8 hydrogen atoms and 3
carbon atoms in each molecule.
We can apply the basic concept of molar mass to compounds as
we did to elements.
The molar mass of a compound is the sum of the molar masses
of all of the atoms which make up the compound.
For example, the molar mass of water, H2O, is the
sum of the molar masses of the one mole oxygen of and the two moles of hydrogen
that comprise it. The molar mass of
hydrogen component is 1.01 gram, and the molar mass of oxygen is 16.00 grams.
The two moles of hydrogen in water have a total molar mass of 2.02 grams which
is added to the molar mass of oxygen which is 16 grams. Thus the molar mass of
the whole compound is 18.02 grams.
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