Chemistry Examples

$O$

Step 1

To find the mass of $1$ mole of $O$ 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 $1$ mole of $O$ $=$ $(mass of O)$

Step 2

Fill in the atomic masses from the periodic table.

mass of $1$ mole of $O$ $=$ $(16)$

Step 3

Remove parentheses.

mass of $1$ mole of $O = 16 g$

Step 4

Find the mass percentage of $O$ .

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Step 4.1

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

Mass percentage of $O = \frac{16}{16} \cdot 100$

Step 4.2

Cancel the common factor of $16$ .

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Step 4.2.1

Cancel the common factor.

$\frac{16}{16} \cdot 100$

Step 4.2.2

Rewrite the expression.

$1 \cdot 100$

Step 4.3

Multiply $100$ by $1$ .

$100$

Step 4.4

Set the number as a percent.

Mass percentage of $O = 100 %$