Some chemistry stuff...

[magdalena]

I am having some problems with my chem review....I am missing notes from my chem classes and are not sure what I am doing right now. I received a lot of help from you last time, and I am hoping you can point me in the right direction this time as well.
here are the questions that have to be answered:

1) How would you make 100 ml of a 40% polyethylene glycol?

2) How would you make 47 ml of 7% solution of sodium chloride?

3) How are 200 ml of 0.3 M NaCl prepared? (MW= 58.44)

4) You have the following solutions 2.5M MgSO4 and 5.0M CaCl2
You want 25 ml of 0.5M Cacl2 and 1.0M MgSO4

any input is welcome.
Thanks.

[magdalena]

I think I got all of them :)
if someone still wants to do them, I would be happy to see if I got the answers right :)

[Bouncer]

i am sure someone here knows the answers. i on the other hand am as dumb as they come. :D