Practice Formula Unit Mass (3.5.2) - Atoms and Molecules

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6 sample questions

Question 1.
Calculate the formula unit mass for sodium chloride (NaCl).
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Add the atomic mass of sodium and chlorine.
Question 2.
What is the atomic mass of sodium (Na)?
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Use the periodic table for the atomic mass.
3Question 3.
What does formula unit mass refer to?
- Molecular weight of molecules
- Atomic mass of ions
- Sum of atomic masses in an ionic compound
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Remember what an ionic compound is.
4Question 4.
True or False: Molecular mass applies only to ionic compounds.
- True
- False
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Recall the definitions of both terms.
Question 5.
Calculate the formula unit mass of potassium permanganate (KMnO4).
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Consider the mass for each atom and multiply when necessary.
Question 6.
If 5 formula units of NaCl react with 3 formula units of CaCl2, what is the total formula unit mass before and after the reaction?
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Use formula unit mass to calculate the starting totals.

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