im having a hard time trying to figure out how to find osmolarities and concentrations of solutions. the instructor doesn't do a very good job of explaining it in understandable terms. i'll likely get a tutor, but i've got homework due monday morning, thus i turn to you for help. examples of what i have to do:

How much magnesium chloride and water is needed to make a .05% solution?

Lactated Ringer's solution has the following composition: 130 mM/L sodium, 109 mM/L chloride, 4 mM/L potassium, 1.4 mM/L calcium, and 28 mM/L lactate. What is the osmolarity of lactated Ringer's solution?

I know this stuff isn't the hardest thing in the world to figure out, but right now the dots just aren't connecting. anyone down to help? or anyone in particular i should pm that might?

ibthreaddropslikearock