[mejia198021]

Does anybody have an idea of converting 0.3 molar concentration to weight percentage.  The closest that I have come to solving this problem is finding the equation:

Cm - 10*C%w/w*d / mM 

Cm = Molar Concentration

C%w/w = Weight Concentration - trying to find?

d= Solution density, which I have no idea how to find?

mM= Molar Mass

Can anyone please help me, I would greatlty appreciate it.
 
Thank you

[Borek]

Cm - 10*C%w/w*d / mM

That's OK. See

http://www.chembuddy.com/?left=concentration&right=percentage-to-molarity 

for derivation.

d= Solution density, which I have no idea how to find?

You have to find density tables - CRC handbook for example, or go to Knovel site and look there for downloadable book called International Critical Tables (note: it is huge, divided in sections and I don't remember which section is the one you need).

Concentration is not large, you may try to assume solution density is that of pure water - 1 g/mL. Error will be in the range of 1.15%

[enahs]

or go to Knovel site and look there for downloadable book called International Critical Tables (note: it is huge, divided in sections and I don't remember which section is the one you need).

The one I find, looks impressive, at least by the index and such.
However, it requires a password? Or is there another one I am not seeing?
http://www.knovel.com/web/portal/basic_search/display?_EXT_KNOVEL_DISPLAY_bookid=735

[Borek]

The one I find, looks impressive, at least by the index and such.
However, it requires a password? Or is there another one I am not seeing?
http://www.knovel.com/web/portal/basic_search/display?_EXT_KNOVEL_DISPLAY_bookid=735

This is the one. Could be they have changed something, but at least few months ago it was freely available. IIRC you had to register - for free - and you could access the book for 30 days. As this is a collection of downloadable pdf files, once downloaded they are yours for ever.

It is also available as torrent download if you know where to look or whom to ask