How many milligrams of neomycin are in 250ml of a 1% neomycin solution?
364108
Hope you didn't turn in your homework based on the friendly_doc answer!  It's wrong.  1% means 1g per 100 mL.  Therefore, in 200 mL, there will be 2g.  So the correct answer to the question is 2.5 grams, or 2,500 mg.
741771
0.5M = 500mM\nv x c=v'xc'\nv x 500 = 50 x 1\n0.1mL of the 0.5M solution diluted to 50mL will be 1mM
784999
.15 M solution of NaCl means .15 moles of NaCl (solute) in 1000g of water (solvent).\ntherefore, to make 250 ml (or g) solution [ as density of H2O is 1]\nmoles of NaCl required = .15/4 = .0375 moles \n& moles = given wt * molecular wt \nso, given wt (or required wt in this case)= moles/ molecular wt. = .0375/58.1 = 645.4388 * 10^-6 g
444108
benfluorex chlorhydrate 150 mg  \nhttp://www.vidal.fr/Medicament/mediator-10625.htm
763695
for med dose calculations us this method D/H times Q\nD equals dosage ordered by physician\nH is what you have on hand\nQ is quantity\n\nfor example 250mg/500mg x 1 tab = 1/2 tablet
876235
The product of a neutrilization reaction is always water and a salt, so use that as a guide.  For part 2, use the units as a guide.  Hint M=molarity=mols/L
220540
Here's a good chart to use\nhttp://www.simetric.co.uk/si_medical.htm\nTo answer your question there are 1000 mcg to 1 mg so 2.5 mg equals 2500 mcg
1078469
0.5 mg is half of a mg\n1 mg is one whole mg
913893
5000 mg / 250 mg/mL = 20 mL\n\n20 mL - 8.6 mL = 11.4 mL
817888
The number of moles of KOH used is:\n\n3.75 g / 56.1 g/mol = 0.0668 moles\n\nin 250 mL (1/4 L) this is 0.0688 * 4 = 0.267 M\n\nM1 * V1 = M2 * V2  or  M2 = (M1 * V1)/V2\n\n= (0.267 M * 27mL)/100mL = 7.209 / 100\n\n= 0.0721 M
775430
25% citric acid will have a concentration of 250 g/l.\n\nDividing by 192.1 g/mol we will get:\n\n(250 g/l) / (192.1 g/mol) = 1.3 mol/l = 1.3 M.
739319
for 1000ug/mL sodium 125mL $32.00
139469
16.45 mL HNO3 solution * [1 liter/1000 mL] * [0.302 moles HNO3/1 liter HNO3 solution] * [1 mol NaOH/1 mol HNO3] * [1 liter NaOH solution/0.250 mol NaOH] * [1000 mL/1 liter]\n\n=67.0 mL NaOH solution\n\nEDIT: [Sorry, the answer above was wrong; I don't know how I got that. The answer is 19.87 mL]\nEND EDIT\n\nBasically, you just use a whole bunch of ratios relating all the units and measurements together.\nIf you write all that out, all the units should cancel except the "mL NaOH solution"\nMight want to check my answer though...\n\n\nNext question:\n[16.45 ml HNO3 solution] * [1 liter/1000 ml] * [0.302 mol HNO3/1 liter HNO3 solution] * [1000 millimoles solution/1 mol solution]\n\n=4.97 millimoles HNO3 solution
1115475
To make 100mL: \n\n0.6% from a 10% solution is 6ml of the 10% diluted in 94ml of H2O.  \n\n0.6% from a 25% solution is 2.4ml of the 25% diluted in 97.6ml of H2O.\n\nThe math?\n\n0.6%*100mL / 10% = 6ml\n\n0.6%*100mL / 25% = 2.4ml
716261
A dozen complete ones of the dosage you list.\n4.01 grams = 4010 milligrams.\n4010 / 325 = 12.33+
371296
well seeing that the molarity of the two solution is a direct ratio of how many molecules there are in the solution, i think that the ration would be 0.15/0.20\n\nso assuming that the reation is 1 to 1 (i cant remember so if it isnt 1 to 1, then i'm wrong) then you would need 18.75 mL of the 0.200 M HCl
479787
In 100g of solution that is 5% by mass NaCl, there are 95 g H2O and 5g Nacl.\nYou want 250g of solution...set up a simple ratio:\n95g H2O/100g Soln = ?g H2O/250g Soln\n? = 237.5g H2O