Q46: half life (2 hrs) is the time it take for the drug concentration to half.ย Since the time course is 6 hours after injection, 3 half-lives have passed.ย The concentration 3 half-lives later is 0.3 mg/L.ย This means at the time of injection, the concentration should be 0.3x2x2x2 = 2.4 mg/L.ย Utilizing the formula mass/volume = concentration, mass (what the question is asking) = volume x concentration = 200L x 2.4 mg/L = 480 mg.
submitted by compasses(14)
total concentration = 0.30mg/l x 200L = 60mg he took the drug 6 hours ago @ t-half of 2 hours 6hrs==60mg 4hours==120mg 2hours==240mg 0hours==480mg