Biochem Qs!! emergency!!?

Question

1) what is 1mmol/l NADH in umol/ml and mgs/ml?
2) what is the importance of NADH metabolically? in quantitavtive analysis?
3) what is 0.005mmol/l Blue Dextran in mgs/ml? in nmol/l?
4) What is Blue Dextan used for in chromatography?
5)Broadly speaking, why is Hemoglobin a colored protein? why was this prepared in physiological salin(0.15mol/l NaCl) as diluent?
6) what is the molarity of a 2g/l glucose soln?
7) a winchester of commercial ammonia(NH3) specifies that it has 8.8g/l ammonia, how would you prepare 0.1 mol/l? what is this soln in mg/ml? umol/ml and %w/v?
8)what is the molecular mass of ethanol? how would you express 70%v/v ethanol in : mol/l, mmol/ml, %w/v and w/w?
[notes the speficifc gravity of ethanol is 0.789g/ml]
9)what is the molarity of a 0.1% w/w/ soln of cholesterol in ethanol? [Mol,mass of cholesterol=386Da]

i reli havnt got a clue here.
im so dead. brainy ppl pls help me!!

Answer 1

1) 1*10^3 umol/ml or 1 mg/ml
[mmol/l = mgs/ml]
2) Enables enzymes to work. Used in kits as it absorbs in the UV spectrum.
3) 5*10^-3 mgs/ml or 5*10^3 nmol/ml
[1 mmol/l = 10^6 nmol/l]
4) Used to measure void volumes in gel filtration columns.
5) Hb is a pigment. Isotonic concentration. If water was used the cells would burst or lyze.
6) 186.16 g in 1 dm-3 (litre) would be molar,
1 g in 1 dm-3 1/186.16 M
2 g in 1 dm-3 2/186.16 M
ans = 1.074 * 10^-2 M
7) The Molecular Mass = 17.0306 g mol-1
so 1litre 0.1M would contain 1.703069 g NH3
You have 8.8 g/l stock....

Answer 2

A lot of your questions are about concentration, this should give some pointers on figuring out how snurbles got there answers. It might also help when you're asked to explain how you got your answers.

http://en.wikipedia.org/wiki/Molarity#Molarity
http://en.wikipedia.org/wiki/NADH

(Hint at least TRY to find out for yourself, before asking others for help. At least if you can figure out why the answers given are what they are, you stand some chance of figuring out answers in more difficult cases, and won't be stuck asking others for help, forever. Sometimes knowing HOW to look, is as important as knowing the "facts")

Answer 3

So you expect us to waste our time doing your home work for you - study like the rest of us did.

THIS IS CALLED CHEATING