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Posted by **kr** on Wednesday, February 1, 2012 at 12:28am.

0.75ml?

- chemistry -
**DrBob222**, Wednesday, February 1, 2012 at 12:43amNo, and you know that is wrong because 60mg/4.0 mL = 15 mg/mL and

15 mg/mL x 0.75 mL is not 20 mg.

(60 mg/4.0 mL) x ?mL = 20 mg.

?mL = 20 x 4/60 = ?

You are allowed 2 s.f.

- chemistry -
**kr**, Wednesday, February 1, 2012 at 12:49am1.3 ml

- chemistry -
**DrBob222**, Wednesday, February 1, 2012 at 1:28amright

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