Counting Atoms in Chemical Formulas
A Grade 12 chemistry worksheet focusing on counting atoms in various chemical formulas, including those with polyatomic ions and hydrates.
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Standards
Counting Atoms in Chemical Formulas
Name:
Date:
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Carefully read each chemical formula and determine the total number of atoms for each element present. Show your work where indicated.
1. In the compound H₂O, there are hydrogen atoms and oxygen atoms.
2. How many atoms of each element are in C₆H₁₂O₆ (glucose)?
Carbon:
Hydrogen:
Oxygen:
3. Explain how to count atoms in a formula containing parentheses, such as Ca(NO₃)₂. Provide the total count for each element in this compound.
4. What is the total number of oxygen atoms in 3 molecules of sulfuric acid, 3H₂SO₄?
4
7
12
16
5. Consider the compound Copper(II) sulfate pentahydrate, CuSO₄·5H₂O. Determine the total number of atoms for each element in this hydrate.
Show your detailed calculations for each element.
6. The coefficient in front of a chemical formula multiplies the number of all atoms in that formula.
True
False