An infant ibuprofen suspension contains 100 mg/5.0 mL suspension. The recommende

Question

An infant ibuprofen suspension contains 100 mg/5.0 mL suspension. The recommended dose is 10 mg/kg body weight. You may want to reference Section 2.7 while completing this problem. How many milliliters of this suspension should be given to an infant weighing 19 lb ? (Assume two significant figures. Express your answer using two significant figures. A 140-lb person burns about 2500 Calories to run a marathon. How much energy is burned in kJ? Assume two significant figures. Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

      1 lb = 453.59 g

mass 19 lb = 19 x 453.59 = 8618.21 g

for 5 ml -------------------------> 100 mg = 0.1g

x=??? -------------------------> 8618.21 g

x = 8618.21 x 5 / 0.1

   = 430910.5 ml

= 4.3 x 10^5 ml

volume (V) = 4.3 x 10^5 ml

(B)

1 cal = 4.184 J

140 lb --------------------------> 2500 cal

         -----------------------> 2500 x 4.184 = 10460 J

          ------------------------> 10kJ

energy = 10 kJ

      

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