Atoms – Moles- Molecules

This week we take the next step in the evolution of mole conversions. So far we have worked on one side of our graphic organizer or the other.

  • Mass of Atoms – Moles of Atoms – Atoms
  • Mass of Molecules – Moles of Molecules – Molecules

This week we connect the dots. This week you’ll be given a mass of molecules and work across the graphic organizer to get to mass of each atom that makes the molecule. ( For example: Mass P2O5 Molecules = Mass of P atoms + Mass of O atoms )

You’ll need to follow dome simple steps, which you have learned how to do in past lessons, in order to come up with your final figures.

  1. Calculate Molar Mass of the molecule (Multiply atomic masses by subscripts; add)
  2. Calculate the moles of the molecule (Given / molar mass)
  3. Calculate the moles of one of the atoms that make up the molecule (moles of molecules x subscript of atom)
  4. Calculate the mass of those atoms (moles of atom x atomic mass)
  5. Calculate the moles of the other atoms that make up the molecule (moles of molecules x subscript of atom)
  6. Calculate the mass of those atoms (moles of atom x atomic mass)
  7. Check your results with the law of conservation of mass (Mass of Molecules = Mass of atoms + Mass of atoms)

 

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