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Molar Mass of Molecules

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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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