What is the pressure of 2 mole of ammonia at $27^{\large\circ}C$ when its volume is 5 litre according to Van der Waal's equation? (a = 4.17 b = 0.03711)

Question

$(a)\;10.33atm\qquad(b)\;9.33atm\qquad(c)\;9.74atm\qquad(d)\;9.29atm$