Chemistry Examples

$F e_{2} O_{3}$

Step 1

To find the mass of $1$ mole of $F e_{2} O_{3}$ look up the atomic mass of each element and multiply it by the number of atoms contained in each element in the molecule.

Step 2

Fill in the atomic masses from the periodic table.

Step 3

Simplify the result.

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Step 3.1

Simplify each term.

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Step 3.1.1

Multiply $2$ by $55.84999847$ .

mass of $1$ mole of $F e_{2} O_{3} = 111.69999694 + 3 (16) g$

Step 3.1.2

Multiply $3$ by $16$ .

mass of $1$ mole of $F e_{2} O_{3} = 111.69999694 + 48 g$

Step 3.2

Add $111.69999694$ and $48$ .

mass of $1$ mole of $F e_{2} O_{3} = 159.69999694 g$

Step 4

Find the mass percentage of $F e$ .

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Step 4.1

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

Mass percentage of $F e = \frac{111.7}{159.69999694} \cdot 100$

Step 4.2

Divide $111.7$ by $159.69999694$ .

$0.69943645 \cdot 100$

Step 4.3

Multiply $0.69943645$ by $100$ .

$69.94364566$

Step 4.4

Set the number as a percent.

Mass percentage of $F e = 69.94364566 %$

Step 5

Find the mass percentage of $O$ .

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Step 5.1

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

Mass percentage of $O = \frac{48}{159.69999694} \cdot 100$

Step 5.2

Divide $48$ by $159.69999694$ .

$0.30056356 \cdot 100$

Step 5.3

Multiply $0.30056356$ by $100$ .

$30.05635624$

Step 5.4

Set the number as a percent.

Mass percentage of $O = 30.05635624 %$

Step 6

Find the mass percentage of each element in the molecule.

Mass percentage of $F e = 69.94364566 %$

Mass percentage of $O = 30.05635624 %$