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# Chemistry Examples

Step 1

To find the mass of mole of look up the atomic mass of each element and multiply it by the number of atoms contained in each element in the molecule.

mass of mole of +

Step 2

Fill in the atomic masses from the periodic table.

mass of mole of +

Step 3

Step 3.1

Remove parentheses.

mass of mole of

Step 3.2

Multiply by .

mass of mole of

Step 3.3

Add and .

mass of mole of

mass of mole of

Step 4

Step 4.1

The mass composition percentage is the mass of divided by the mass of the entire molecule converted to a percentage.

Mass percentage of

Step 4.2

Divide by .

Step 4.3

Multiply by .

Step 4.4

Set the number as a percent.

Mass percentage of

Mass percentage of

Step 5

Step 5.1

The mass composition percentage is the mass of divided by the mass of the entire molecule converted to a percentage.

Mass percentage of

Step 5.2

Divide by .

Step 5.3

Multiply by .

Step 5.4

Set the number as a percent.

Mass percentage of

Mass percentage of

Step 6

Find the mass percentage of each element in the molecule.

Mass percentage of

Mass percentage of