how many grams of ZnCl2 are needed to prepare 250 ml of an aqueous solution with an osmolarity equal to 0.300 osmol?

Question

I posted this question a few minutes ago, but forgot to add the last part of the sentence. Thanks!

Answer 1

I think I answered it.
Osm = i*M where i is the van't Hoff factor.

Answer 2

87