Counting Atoms in Chemical Formulas
A Grade 12 chemistry worksheet to practice counting atoms in various chemical formulas, including those with parentheses and coefficients.
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Counting Atoms in Chemical Formulas
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Carefully analyze each chemical formula and determine the total number of atoms for each element present. Pay close attention to subscripts, parentheses, and coefficients.
1. In H₂O, there are hydrogen atoms and oxygen atoms.
2. In CO₂, there is carbon atom and oxygen atoms.
3. In NaCl, there is sodium atom and chlorine atom.
4. In C₆H₁₂O₆, there are carbon atoms, hydrogen atoms, and oxygen atoms.
5. How many oxygen atoms are in Mg(OH)₂?
1
2
3
4
6. How many total atoms are in (NH₄)₃PO₄?
18
20
21
23
7. For the compound 2H₂SO₄, list the number of atoms for each element.
8. How many total oxygen atoms are present in 3Ca(NO₃)₂?
9. In the formula 4Fe₂(SO₄)₃, there are 12 sulfur atoms.
True
False
10. The coefficient in a chemical formula multiplies all atoms in the entire formula.
True
False
11. Consider the compound 2K₃[Fe(CN)₆]. Determine the total number of potassium, iron, carbon, and nitrogen atoms.
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