An order for ampicillin is 45 mg/kg of body mass. Calculate the dosage of ampicillin in g/lb of body weight. Express the dosage in g/lb to two significant figures.
Could anybody explain how to do this?

0.020g/lb

Explanation:

We start off with 45 mg/kg.

Let's convert the mg to g first to get half the units correct.

1g = 1000mg

Therefore 45mg = 0.045g.

Now we're at 0.045g/kg.

Next we need to convert the kg to lbs.

1 kg = 2.20462262 lbs.

therefore we need to divide 0.045 by 2.20462... to get g/lbs

This gives 0.02041165667 g/lb.

We need this to 2SF, so round to 0.020g/lb

2b2t

explanation:

2b2t