# What is the density of methyl chloride gas, CH_3Cl, at STP?

##### 1 Answer
May 17, 2016

If you assume it behaves as an ideal gas, then $0.00225$ $g$/$m l$ at $S T P$.

#### Explanation:

If you assume that it behaves as an ideal gas then it's simple enough, and will give you a fair estimate:

One mole of an ideal gas at STP occupies $22.4$ $L$. Molar mass of methyl chloride is $50.49$ $g$/$m o l$.

Then simply divide the molar mass by the molar volume which gives you a density in $g$/$l$.

i.e. $\text{Density" = "Molar mass"/"Molar volume}$

= $\frac{50.49}{22.4}$ = $2.25$ $g$/$L$ = $0.00225$ $g$/$m l$.

If you want a more accurate figure you will need to use the full form of the gas equation incorporating a virial expansion, but that's a lot more complicated!