Chemistry Examples

$L i$

Step 1

To find the mass of $1$ mole of $L i$ 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 $L i$ $=$ $(mass of Li)$

Step 2

Fill in the atomic masses from the periodic table.

mass of $1$ mole of $L i$ $=$ $(6.94000005)$

Step 3

Remove parentheses.

mass of $1$ mole of $L i = 6.94000005 g$

Step 4

Find the mass percentage of $L i$ .

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Step 4.1

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

Mass percentage of $L i = \frac{6.94}{6.94000005} \cdot 100$

Step 4.2

Divide $6.94$ by $6.94000005$ .

$0.99999999 \cdot 100$

Step 4.3

Multiply $0.99999999$ by $100$ .

$99.99999917$

Step 4.4

Set the number as a percent.

Mass percentage of $L i = 99.99999917 %$