[mass]

1.How much of alcohol 95% is required to make 2 litre of a 19%
2. Convert the following into 1 in
42. 12.5%
43. 67mg in 10 ml

3. How much solid drug is required to prepare the following solutions?
44. 350ml of a 4.5%
45. 0.3 litre of a 0.8%

5. The relative molecular mass of sodium chloride is 58.4, what mass would be required to prepare 200ml of a solution containing 150millimoles per litre?

[Borek]

How many times you have been asked to read forum rules?

[mass]

this is the 1st time, i need help.

[JGK]

http://www.chemtutor.com/unit.htm

http://www.sciencecompany.com/lab/test_solns.htm