The Merck Index indicates that 10 mg of guanidine, CH₅N₃, may be administered for each kilogram of body mass in the treatment of myasthenia gravis. The nitrogen in a 4-tablet sample that had a total mass of 7.66 g was converted to ammonia by a Kjeldahl digestion, followed by distillation into 100.0 mL of 0.1822 M HCl. The analysis was completed by titrating the excess acid with 11.56 mL of 0.1104 M NaOH. How many of these tablets represent a proper dose for a patient who weighs

(a) 100 lb, 

(b) 150 lb, 

(c) 275 lb?