[ETM98]

Can some one show me how to do this problem.
I have a few of them to do and just need this one completed as an example.

Calculate osmolarity of 6.5% w/v Na₂SO₄.

Relative atomic masses (amu): O = 16.0, Na = 23.0, S = 32.1

Thanks

[plankk]

Change the w/v concentration to molarity. When the salt dissociates fully, the osmolarity is result of multiplication molarity with the number of ions from one particle. For example 1 mol/L NaCl is 2 osmol/L.