Counting Atoms Practice
3 Ca(HCO3)2
How many Ca atoms are present? ______
How many H atoms are present? ______
How many C atoms are present? ______
How many O atoms are present? ______
How many total atoms are present? ______
How many molecules are present? ______
What is the polyatomic ion present? ______
How many elements are present?________
Directions: Use the formulas given to answer the questions that follow.
1. 5 Al2(CO3)3
How many Al atoms? _____ How many molecules? _____
How many C atoms? _____ What is the polyatomic ion present? _____
How many O atoms? _____ How many total atoms? _____
2. 2 C11H22O11
How many C atoms? _____ How many molecules? _____
How many H atoms? _____ What is the polyatomic ion present? _____
How many O atoms? _____ How many total atoms? _____
3. Ca(CO3)
How many Ca atoms? _____ How many molecules? _____
How many C atoms? _____ What is the polyatomic ion present? _____
How many O atoms? _____ How many total atoms? _____
4. 4 Na3(PO4)
How many Na atoms? _____ How many molecules? _____
How many P atoms? _____ What is the polyatomic ion present? _____
How many O atoms? _____ How many total atoms? _____
5. 3 Al2(SO4)3
How many Al atoms? _____ How many molecules? _____
How many S atoms? _____ What is the polyatomic ion present? _____
How many O atoms? _____ How many total atoms? _____
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6. 3 Ca(HCO3)2 Ca = H = C = O = Total atoms = |
7. 4 H2SO4 H = S = O = Total atoms = Polyatomic ion = |
8. 5 H3PO4 H = P = 0 = # of molecules = Total atoms = |
9. 8 C6H12O6 C = H = O = Polyatomic ion = # of molecules =
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10. 4 KI K = I = Total atoms =
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11. 2 HgBr2 Hg = Br = # of molecules = |
12. 7 CuBr2 Cu = Br = Polyatomic ion = |
13. 4 LiBr Li = Br = Total atoms = |
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14. 20 K2SO4
Total atoms = Polyatomic ion =
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15. NH4OH
Polyatomic ion = # of molecules = |
16. 3 Fe(OH)2
# of molecules = Total atoms = |
17. 6 CO2
# of molecules = Total atoms = |
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18. 3 Cu2 (CO3)
Polyatomic ion =
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19. 2 Ni3(PO4)2
Total atoms = |
20. 6 (NH4)3PO4
Polyatomic ion = |
21. 2 Na(NO2)
# of molecules =
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