Posted by Sarah on Monday, November 21, 2011 at 9:13am.
You can't without knowing the mass.
or do you mean
How do you convert 25.0 mg/mL to mg/cc?
the mass is 225 lb
OK so you need to convert the mass of 225 lb to mg.
if we take 1 lb =454 g, or the conversion factor is 454 g lb^-1
then 225 lb is
225 lb x 454 g lb^-1
which in mg is
M = 225 lb x 454 g lb^-1 x 1000 mg g^-1
volume = mass/density
volume = M/(25.0 mg/mL)
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