Counting Atoms

Front

What is the formula to determine the number of atoms in a compound?

Back

To determine the number of atoms in a compound, multiply the coefficient (if present) by the subscript of each element in the formula.

Front

How many Sodium (Na) atoms are in 6NaCl?

Back

6

Front

How many Hydrogen (H) atoms are in 4CH₄?

Back

16

Front

How many Hydrogen (H) atoms are in 3(NH₄)₂CrO₄?

Back

24

Front

How many Magnesium (Mg) atoms are in 10MgCl₂?

Back

10

Front

How many Oxygen (O) atoms are in 5H₂O?

Back

5

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element in the molecule.

Front

What does a coefficient in a chemical formula indicate?

Back

A coefficient indicates the number of molecules or formula units of the compound.

Front

In the compound H₂O, how many total atoms are present?

Back

There are 3 total atoms (2 Hydrogen and 1 Oxygen).

Front

What is the total number of atoms in 2Na₂SO₄?

Back

There are 10 total atoms (4 Sodium, 1 Sulfur, 8 Oxygen).