Percent Composition

The percent composition is simply a way of relating the relative amounts of elements in a compound. For instance, a molecule of water (with a molar mass of approximately 18g/mol) contains 2 atoms of hydrogen (molar mass of approximately 1 g/mol). So the percent of hydrogen is:

 

 

 

The percent oxygen could be found in a similar manner

 

 

 

Of course you could also have gotten the percent oxygen by subtraction

 

 

Let's look at a more complicated example:

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