g/ml to mg/m3

3.45 g/ml * 1000 mg/g * 1 ml/cm^3 * 10^6 cm^3/m^3 = 3.35 * 10^9 mg/m^3.

Forum members: This is likely a homework question but if the questioner learns from this how to perform dimensional analysis, it will be a lesson that will serve him well.

Guest: If you don't understand the technique used to get the answer above, you would be well-advised to say so and learn how to do this kind of simple conversion. It is a skill that will serve you a lifetime.