The concentration of a substance dissolved in water $i$ is known in (mol/m3), so is the molar mass in (g/mol) and the density in (g/m3).
I want to find the volume of this substance in m3.
I have two possible ideas for equations to use: $$\mathrm{volume}_i= \frac{\mathrm{mass}_i}{c_i \times M_{W,i}},$$ however, to use this equation I need to know the mass of the substance, which is not obvious.
Also I could use something like this: $$\mathrm{volume}_i = \frac{c_i \times M_{W,i} \times \mathrm{volume}_{?}}{\rho_i },$$ however, I'm not sure what volume$_?$ would be, as I don't know the volume of the solution and I am trying to find the volume of the substance $i$.
Any ideas how to find the mass in the first equation or the volume in the second equation, or other equations to use?
Extra comments: My real aim is to find the volume of the solution so I can use the following formula for volume concentration, where I already know the volume concentration $\phi_i $: $$\phi_i = \frac{\mathrm{volume}_i} {\mathrm{volume}_\mathrm{solution}} $$ or $$\mathrm{volume}_\mathrm{solution} = \frac{\mathrm{volume}_i} {\phi_i} $$