Chemistry 121 ABC

Question

A prescription medication requires 6.69 mg per kg of body weight. Determine the correct dose (in g) for a 

155-lb patient.

Express your answer with the appropriate units.

Answer 1

I kg = 2.2lbs, so if we convert lbs to kg, we would have 155/2.2 = 70.45kg. We then take the 70.45kg and multiply it by 6.69mg/kg, so we have 70.45kg*[6.69m/1kg], and we get 471.3mg. We then divide that by 1000 to convert mg to kg. So we end up with 0.471g.