Find the Density at STP HO

$H O$

Step 1

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

Step 2

Fill in the atomic masses from the periodic table.

mass of $1$ mole of $H O$ $=$ $(1.00999999)$ + $(16)$

Step 3

Simplify the result.

Remove parentheses.

mass of $1$ mole of $H O = 1.00999999 + 16 g$

Add $1.00999999$ and $16$ .

mass of $1$ mole of $H O = 17.00999999 g$

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.

$\frac{17.00999999 g}{22.4 L}$

Step 6

Factor $17.00999999$ out of $17.00999999 g$ .

$\frac{17.00999999 (g)}{22.4 L}$

Step 7

Factor $22.4$ out of $22.4 L$ .

$\frac{17.00999999 (g)}{22.4 (L)}$

Step 8

Separate fractions.

$\frac{17.00999999}{22.4} \cdot \frac{g}{L}$

Step 9

Divide $17.00999999$ by $22.4$ .

$0.75937499 \frac{g}{L}$

Step 10

Combine $0.75937499$ and $\frac{g}{L}$ .

$\frac{0.75937499 g}{L}$

Find the Density at STP HO

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