We will use the following formula to solve for pressure .
PV = nRT
• Where P = Pressure at temperature T
V = Volume = 1 litre
n = 5 moles
R =universal gas contant = 0.082L atm
T = Temperature = 200 +273 =473K
P = nRT /V
P = (5 *0.082 * 473 )/10
P = 193.93/10 = 19.39