Counting Atoms in Compounds
This worksheet focuses on understanding chemical formulas and accurately counting the number of atoms for each element within various chemical compounds, suitable for Grade 12 chemistry students.
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Counting Atoms in Compounds
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Carefully read each chemical formula and determine the total number of atoms for each element present in the compound. Pay close attention to subscripts and coefficients.
1. In the compound H2O, there are hydrogen atoms and oxygen atoms.
2. The formula for glucose is C6H12O6. This compound contains carbon atoms, hydrogen atoms, and oxygen atoms.
3. For the compound 2NaCl, there are sodium atoms and chlorine atoms.
4. In Ca(NO3)2, the number of calcium atoms is , nitrogen atoms is , and oxygen atoms is .
5. How many total atoms are in one molecule of sulfuric acid, H2SO4?
6
7
8
9
6. Which of the following compounds contains the most oxygen atoms per molecule?
CO2
H2O2
N2O5
SO3
7. Determine the number of each type of atom in 3 molecules of (NH4)3PO4.
8. A chemist needs to prepare a solution containing 10 moles of water. How many hydrogen atoms are present in this amount of water?
9. In the chemical formula 5Al2(SO4)3, there are a total of 10 aluminum atoms.
True
False
Match the compound with the correct number of oxygen atoms.
10. C12H22O11
a. 2
11. KMnO4
b. 4
12. H2CO3
c. 3
13. NaHCO3
d. 11
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