Chemistry Examples

$F e$

Step 1

To find the mass of $1$ mole of $F e$ 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 $F e$ $=$ $(mass of Fe)$

Step 2

Fill in the atomic masses from the periodic table.

mass of $1$ mole of $F e$ $=$ $(55.84999847)$

Step 3

Remove parentheses.

mass of $1$ mole of $F e = 55.84999847 g$

Step 4

One mole of any gas occupies $22.4 L$ at STP (standard temperature and pressure).

$V = 22.4 L$

Step 5

Density is mass over volume.

$\frac{55.84999847 g}{22.4 L}$

Step 6

Factor $55.84999847$ out of $55.84999847 g$ .

$\frac{55.84999847 (g)}{22.4 L}$

Step 7

Factor $22.4$ out of $22.4 L$ .

$\frac{55.84999847 (g)}{22.4 (L)}$

Step 8

Separate fractions.

$\frac{55.84999847}{22.4} \cdot \frac{g}{L}$

Step 9

Divide $55.84999847$ by $22.4$ .

$2.4933035 \frac{g}{L}$

Step 10

Combine $2.4933035$ and $\frac{g}{L}$ .

$\frac{2.4933035 g}{L}$