Answer:
Ideal Gas Law ( PV = nRT)
Explanation:
Using the Ideal Gas Law, we have; PV = nRT
Where P= Pressure = ?
      V= Volume = 8.0 L
      n =  moles = 8.0
      R =  Gas constant = 0.0821 L.atm/mol/K
      T =  80° c + 273 =  353.15K
Therefore Pressure would be; Â P = nRT/ V = Â 8 x 0.0821 x 353.15 / 8 = 28.9atm