El agua salubre es aquella que tiene más sales disueltas que el agua dulce. En el análisis de una muestra de aguas se encontró que contenía 3,8 gramos de cloruro de magnesio (MgCl2) en un volumen de 900 mL, con una densidad disolución 1,09 g/mL. Considerándose la densidad del soluto de 2,32 g/mL.

0.39 % m/m; 0.42 % m/v; 0.18 % v/v; 4200 ppm; 0.044 mol·L⁻¹; 0.041 mol/kg;

0.089 equiv/L; 0.000 74; 0.999 26

Explanation

Data:

Mass  of MgCl₂       =       3.8   g

Volume of solution =  900      mL

Density of solution =       1.09 g/mL

Density of MgCl₂    =      2.32 g/cm³

Calculations

1. Percent m/m

2. Percent m/v

3. Percent v/v

4. Parts per million

5. Molar concentration

6. Molal concentration

Mass of water = Mass of solution - mass of solute = 981 g - 3.8 g = 977 g = 0.977 kg

7. Normality

The normality is the number of equivalents per litre of solution.

The normality of an ion equals the molar concentration times the charge on the ion.

Thus, the normality of MgCl₂ is twice the molar concentration.

Normality = 2 × 0.044 mol·L⁻¹ = 0.089 equiv·L⁻¹

8. Mole fraction of solute

Moles of MgCl₂ = 0.040 mol

Total moles = n₂ + n₁ = 0.040 mol + 54.23 mol = 54.27 mol

9. Mole fraction of solvent

χ₁ = 1 - χ₂ = 1 - 0.000 74 = 0.999 26

the answer is 303.15 or 303

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).