Mixing solutions with different solutes without chemical reaction

question 1

In a practical class, a student makes a mixture using 300 mL of 4 mol/L aqueous magnesium hydroxide solution, with 600 mL of 8.5 g/L aqueous magnesium chloride solution. What will be the concentration of magnesium cations in the final solution? Data: (Mg = 24 g/mol Cl=35.5 g/mol, O=16 g/mol, H=1 g/mol):

a) 1.82 mol/L

b) 1.72mol/L

c) 1.62 mol/L

d) 1.42 mol/L

e) 1.52 mol/L

question 2

By mixing 250 mL of 0.40 mol aqueous solution. L^-1 of lithium iodide with 450 ml of 0.35 mol aqueous solution. L^-1 of barium iodide, the resulting solution will present, respectively, the following concentrations of Li⁺¹, Ba⁺² Hey^-1:

a) 0.143 mol. L^-1, 0.225 mol. L^-1, 0.593 mol. L^-1

b) 0.243 mol. L^-1, 0.3225 mol. L^-1, 0.693 mol. L^-1

c) 0.343 mol. L^-1, 0.425 mol. L^-1, 0.793 mol. L^-1

d) 0.443 mol. L^-1, 0.525 mol. L^-1, 0.893 mol. L^-1

e) 0.543 mol. L^-1, 0.625 mol. L^-1, 0.993 mol. L^-1

More questions

In this class we will see a brief review about probability and how to solve this issue in Enem.

Stoichiometry is a recurrent theme in Enem tests, it appears in a pure and applied way or involved with other topics of chemistry. Today we will make a brief review of this matter by analyzing some questions asked previously in Enem.