What is the density of CO2 gas at -25.2 degrees celsius and 98.0kPa?

2 answers

PV=nRT

density =mass/volume =mass/V

n=mass/M where M = molar mass

PV=mass R T /M

rearrange

PM/RT=mass/V=density
Oh and with questions like this it is worth making sure that the question makes sense.

In this case -25.2 degrees celsius and 98.0kPa is located below and to the right of the triple point for CO2 see

http://stevengoddard.files.wordpress.com/2010/09/co2_phase_diagram.gif?w=500&h=380

and so is definitely a gas.