How to Calculate the Formula Mass of a Compound

Learn how to find the formula mass of any chemical compound in simple steps.

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To find formula mass, add the atomic masses of all atoms in a molecule's chemical formula. For instance, for H2O, add the atomic masses of 2 hydrogen atoms (1.01 each) and 1 oxygen atom (16.00). Thus, formula mass = (2 * 1.01) + 16.00 = 18.02 u.

FAQs & Answers

  1. What is the formula mass of H2O? The formula mass of H2O is 18.02 u, calculated by adding the atomic masses of 2 hydrogen atoms and 1 oxygen atom.
  2. Why is understanding formula mass important? Understanding formula mass is essential for calculating concentrations, preparing solutions, and studying chemical reactions.
  3. How do I find the atomic mass of an element? You can find the atomic mass of an element on the periodic table, which lists each element's average atomic mass.
  4. Can formula mass be different for isotopes? Yes, the formula mass may vary depending on the isotopes of the elements present in the compound.

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