Answer:
49.82414 atm
50.74675 atm
Step-by-step explanation:
P = Pressure
V = Volume = 5.45 L
R = Gas constant = 0.08205 L atm/mol K
T = Temperature = 25°C
a = 0.211 atm L²/mol²
b = 0.0171 atm L²/mol²
From ideal gas law we have

The pressure is 49.82414 atm
From Van der Waals equation we have

The pressure is 50.74675 atm