chemistry
posted by Selina .
How do I work out the density of HCI at 600 celsius ?
Thanks

I assume you mean the gas, hydrogen chloride.
PV=nRT
density is mass/volume
n/V=P/RT
mass/V= molmass*Pressure/RT 
I would use PV = nRT and rework it a little
n = g/M where M is molar mass.
PV = (g/M)RT, then
PVM = gRT and
PM = gRT/V where g/V is the density and solve for g/V = density = PM/RT. Check my algebra. 
Thank you guys I will try both suggestions

OK to try both I suppose but aren't both the same? (They are the same formula!)