Step-by-step explanation:
Use the ideal gas law :
PV = n R T P = 855 Torr R =(gas constant) = 62.363598 L Torr / (K mol)
T = (98 + 273.15 ) K V = ?
molecular weight of CH4 = 12.011 + 1.008 * 4 = 16.043 gm/mole
then n = # moles = .985 gm / 16.043 gm / mole = . 0614 moles
Plug into the formula :
PV = nRT
V = n R T / P = .0614 * 62.363598 * (98+273.15) / 855 <=========
I think you can finish this with your calculator to find the volume in liters ......