Answer:
The solution of [tex]MgCl_2[/tex] will have the lower vapor pressure.
Explanation:
Hi, due to the Colligative properties the vapor pressure of a solution decreases proportional to the mols of ions or molecules disolved in it.
So, the more molecules you disolve in a solvent, the more its vapor pressure decreases.
Now, all six solutes are in the same amount of molecules (same molarity) but:
1) [tex]NaCl[/tex] and [tex]MgSO_4[/tex] when mixed on water disociate:
[tex]NaCl \longrightarrow Na^+ +Cl^-[/tex]
[tex]MgSO_4 \longrightarrow Mg^{+2} + SO_4^{-2}[/tex]
Each molecule gives two new molecules two the solution so this two solutions would have a concentraion of 2*0.0001 m= 0.0002 m
2) Aspirin, dextrose and mannitol when mixed in water, don't disociate so they concentration would remain 0.0001 m.
3) At last [tex]MgCl_2[/tex] disociates giving 3 molecules:
[tex]MgCl_2 \longrightarrow Mg^{+2} + 2 Cl^-[/tex]
Its concentration would be 3*0.0001 m = 0.0003 m
Being said that the more molecules you disolve the lower the vapor pressure, the solution of [tex]MgCl_2[/tex] will have the lower vapor pressure.
