Counting Atoms in Chemical Formulas

Counting Atoms in Chemical Formulas

Read each chemical formula carefully and determine the number of atoms for each element present. Show your work or explain your reasoning where indicated.

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.

1. How many atoms of each element are in 2H₂SO₄?

2. Determine the number of atoms for each element in 3Ca(NO₃)₂.

1. How many total atoms are present in one molecule of Al₂(SO₄)₃?

2. In the formula 4Fe₂(Cr₂O₇)₃, how many oxygen atoms are present?

1. In Mg(OH)₂, there are two oxygen atoms and two hydrogen atoms.

2. The coefficient in front of a chemical formula multiplies all atoms in that formula.

1. A compound has the formula (NH₄)₃PO₄. If you have 5 molecules of this compound, how many atoms of each element (Nitrogen, Hydrogen, Phosphorus, Oxygen) are present in total? Show your calculations.