What About Compounds?
To calculate the atomic mass of a compound you will need a calculator, periodic table, pencil and paper.
1. Write out the chemical formula of the compound. For example: H2O.
2. Next, check the periodic table for the atomic mass of the elements used. Example: Hydrogen = 1.0079, Oxygen= 15.9994.
3. Next multiply the number of atoms of each element by the atomic mass of the element. Example: You have two hydrogen atoms times the mass. 2 x 1.0079= 2.0158. There is only one oxygen atom: 15.9994.
4. Finally, add the multiplication results. 2.0158 + 15.9994 = 18.0098. The atomic mass of the compound H2O is 18.0098.
Atomic mass is a basic chemistry concept. Defining and calculating atomic mass is not difficult; you just need the correct tools and an understanding of the chemistry terms.
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