Hi Guys!! my question goes like this a 5% solution of urea is isotonics with 0.877% of Solute A. Calculate the relative molecular weight of solute A. now my dear friend, i know its a very simple question but unfortunately, just cant getting any interpretation. I know isotonics sol means having same no. of moles. and i know that Grahams's law of diffusion as well. Please help me so that i can understand this question.