Counting Atoms

Front

What is the formula for calculating the number of atoms in a compound?

Back

To find the total number of atoms in a compound, multiply the number of atoms of each element by its subscript and sum them up.

Front

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

Back

There are 2 aluminum atoms, 3 sulfur atoms, and 12 oxygen atoms, totaling 17 atoms.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element it follows.

Front

In the compound Mg(NO₃)₂, how many nitrogen atoms are present?

Back

There are 2 nitrogen atoms.

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses group elements together, and a subscript outside the parentheses applies to all elements inside.

Front

How many oxygen atoms are in the compound Ca(NO₃)₂?

Back

There are 6 oxygen atoms.

Front

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

Back

There are 24 total atoms (6 carbon, 12 hydrogen, 6 oxygen).

Front

How many sulfur atoms are in the compound Al₂(SO₄)₃?

Back

There are 3 sulfur atoms.

Front

What does the term 'coefficient' refer to in a chemical equation?

Back

A coefficient indicates the number of molecules or moles of a compound.

Front

How many aluminum atoms are in Al₂O₃?

Back

There are 2 aluminum atoms.