Counting Atoms

Front

What is the chemical formula for sodium sulfate?

Back

Na₂SO₄

Front

How many total atoms are in the formula Al₂(SO₄)₃?

Back

23 atoms (2 Al + 3 S + 12 O)

Front

What does the subscript in a chemical formula indicate?

Back

The number of atoms of that element in the molecule.

Front

How many oxygen atoms are in the formula for sodium sulfate (Na₂SO₄)?

Back

4 oxygen atoms.

Front

What is the total number of atoms in 3Na₂B₄O₇?

Back

39 atoms.

Front

How many carbon atoms are in the formula 2Na₂CO₃?

Back

2 carbon atoms.

Front

What is the significance of parentheses in a chemical formula?

Back

They indicate that the enclosed atoms are a group that can be multiplied by the subscript outside.

Front

How many sulfur atoms are in the formula for sodium sulfate (Na₂SO₄)?

Back

1 sulfur atom.

Front

What is the total number of atoms in the compound C₆H₁₂O₆?

Back

24 atoms (6 C + 12 H + 6 O).

Front

How do you determine the number of hydrogen atoms in a compound?

Back

Count the H atoms in the formula, considering any coefficients.