In the case of water at 4oC, 1 milliliter has the mass of 1 gram. As 1 gram = 1000 mg, 1 ml is equal to 1000 mg. For materials of any other density there is no common relationship between mla dn mg.
6.8mg = 1ml
For water, the answer is 1000 mg
20
0,4 ml
1mM DPPH (MW 394.32) solution would be 0.39 mg/1mL 1M = 390 mg/1mL
Their are two sizes 10 mg of moriphine in .7 ml of water and 20 mg in 1ml of water.
You should calculate this way : 75 mg = 1 ml 45 mg = ? ml ( 45 mg x 1ml ) / 75 mg = 0,6 ml
1ML === ===
Its the metric system. 1mL=1000mg milliliter, milligram
1mL = 1cc
1ml of water is 1 g or 1000 mg % = 5/1000 x 100 = 0.5%
6mg*(1ml/15mg)=0.40 ml