by Guest » Tue May 17, 2005 1:49 am
1) From chemical formula and periodic table, add up the atomic weights in the chemical formula to determine the molar mass.
2) Divide the mass of gas you have by the molar mass to get number of moles.
3) Plug number of moles and pressure, temperature conditions into the Ideal gas law, PV = nRT
If you want to work in English units, you'll have to find R, the gas constant, in appropriate units.