[moil60]

 when calculating the osmotic pressure of a solution with 0.03M ammonium sulfate and 0.04M sucrose...do i need to add the concentration for sucrose?

2 ions of ammonium
1 ion of sulphate

3 x 0.03M = 0.09M

do i need to add the 0.04M ?

thanks
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[Borek]

ALL ions and molecules present in the solution, so yes.