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Determining the Molecular Weight of a Substance from its Formula

Determining the Molecular Weight of a Substance from its Formula. Why is Molecular Weight Important?. The molecular weight of a substance is the weight in atomic mass units of all the atoms in a given formula. (Remember that one atomic mass unit is roughly equal to one proton or neutron.)

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Determining the Molecular Weight of a Substance from its Formula

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  1. Determining the Molecular Weight of a Substance from its Formula

  2. Why is Molecular Weight Important? • The molecular weight of a substance is the weight in atomic mass units of all the atoms in a given formula. (Remember that one atomic mass unit is roughly equal to one proton or neutron.) • Knowing the molecular weight will help you to be able to identify what specifically is going to happen or what is happening in a chemical reaction. • Molecular weight is something you can measure with a balance.

  3. Visit the site below: http://dbhs.wvusd.k12.ca.us/Mole/MolecWt.html

  4. Question #1—(answer in online lab notebook) • How many atoms does the molecule K2SO4 contain?

  5. Question #2 • How many different elements does the molecule K2SO4 contain?

  6. Question #3 • How many potassium (K) atoms does K2SO4 contain? How many sulfur (S)? How many oxygen (O)?

  7. Question #4 • What is the molecular weight of K2SO4 ?

  8. Question #5 • How many oxygen (O) atoms does Al(MnO4)3 contain?

  9. Question #6 • What is the molecular weight of Al(MnO4)3 ?

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