# What is the density of krypton gas at STP?

Dec 3, 2015

The density of krypton at STP is $\text{3.74 kg/m"^3}$, or $\text{0.00374 g/cm"^3}$ at STP of ${0}^{\text{o""C}}$ $\left(\text{273.15 K}\right)$ and $\text{1 atm}$.
http://www.engineeringtoolbox.com/gas-density-d_158.html
The calculated density is $\text{0.0037386 g/cm"^3}$.

#### Explanation:

How to Calculate Density of Krypton from Molar Mass and Molar Volume.

Molar mass $\left(\text{MM}\right)$ is the atomic weight of an element on the periodic table in g/mol.

$\text{MM"_"Kr"="83.798 g/mol}$
http://www.nist.gov/pml/data/periodic.cfm

Molar Volume $\left({V}_{\text{m}}\right)$ at STP is $\text{22.414 L/mol}$
https://en.wikipedia.org/wiki/Molar_volume

"Density"=("MM")/(V_"m")

$\text{Density"_"Kr"=(83.798 "g"/cancel"mol")/(22.414"L"/cancel"mol")="3.7386 g/L}$

(3.7386"g")/(1"L")xx(1"L")/(1000"mL")="0.0037386 g/mL"="0.0037386 g/cm"^3" $\left(\text{1mL=1cm"^3}\right)$