A dialysis machine will be designed to remove urea from the blood of a kidney patient. The concentration of urea in the blood is initially 26 mg/100 cc and after undergoing dialysis it should be 1 mg/100 cc. The membrane thickness is 1.59 X 10^-5 m, K = 0.75, DAB = 3.5 x 10^-11 m²/s inside the membrane, the mass transfer coefficient in the blood is 1.25 X 10^-5 m/s and 3.33 x 10^-5 m/s in the dialysate. Calculate the total area of the membrane in m² of the dialysis machine if its to remove 7 g urea /h. Answer in whole number.