Chemistry - Percent Composition by Mass

Chemistry - Percent Composition by Mass

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  • Hey Mrs. Johnson I'm having trouble with my Chemistry. It's something about calculating percent composition by mass. Can you help me please?
  • Of course I can help you! It's very simple once you get the hang of it! It only requires 3 steps.
  • Do you have an example problem from your homework?
  • Yes, let us use the compound Magnesium Chloride.
  • As we can see the board, we need to identify the formula for Magnesium Chloride. Using the period table, it is MgCl2.
  • Step 1: Determine the correct Formula
  • I know that part...
  • Step 2: Determine the molar mass of the compound
  • Next we need to see the Molar Mass of the compound by adding up the atomic mass of all elements respectively with how many of each atop there are.
  • 1 atom of Mg has a mass of about 24.3 g/mol and 1 atom of Cl has a mass of 35.5 g/mol which when you multiply by two atoms will get you 71.0 g/mol. This gives a combined total of about 95.3 g/mol rounded.
  • Step 2: Determine the molar mass of the compound
  • That's right!
  • What comes after that?
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