Question

A nurse practitioner orders Medrol to be given 1.4 mg/kg of body weight. Medrol is an anti-inflammatory administered as an intramuscular injection. If a child weighs 71.6 lb and the available stock of Medrol is 20. mg/mL, how many milliliters does the nurse administer to the child? Express your answer to two significant figures and include the appropriate units.​

Answer 1

The nurse give 2.3 ml Medrol to the child

Further explanation

Mass is one of the principal quantities, which is related to the matter in the object  

The main mass unit consists of 7 units

kg, hg, dag, g, dg, cg, mg

Conversion :

1 Lb=0,453592 kg

For 71.6 lb :

$\tt 71.6\times 0.453592=32.48~kg$

Medrol to be given 1.4 mg/kg of body weight, so amount for the child :

$\tt 32.48~kg\times 1.4~mg/kg=45.472~mg$

The available stock of Medrol is 20. mg/mL, so the volume to the child :

$\tt \dfrac{45.472}{20}=2.2736\approx2.3~ml$