Respuesta :
Answer:
The solution with the lowest boiling point is: d. 0,20 [tex]C_{2}H_{6}O_{2}[/tex]
Explanation:
The boiling point depends on the boiling point elevation which is a colligative property. All colligative properties depend on the concentration of particles (ions) present. So then, the concentration of particles for each point is determined by multiplying the molarity given by the Van’t Hoff factor. Each of these is calculated as follows:
a. 0,15M NaCl
1. The dissolution of sodium chloride can be represented by the following equation:
[tex]NaCl(s)\rightarrow Na^{+}(ac)+Cl^{-}(ac)[/tex], so we have 2 particles (ions)
2. Replacing the value of 2 particles in the following formula:
[tex]Concentration=(i)*(M)\\Concentration= (2)*(0,15)\\Concentration=0,30[/tex]
b. 0.10 M [tex]MgBr_{2}[/tex]
1. The dissolution of Magnesium Bromide can be represented by the following equation:
[tex][tex]MgBr_2\rightarrow Mg^{+2}(ac)+2Br^{-}(ac)[/tex][/tex], so we have 3 particles (ions)
2. Replacing the value of 3 particles in the following formula:
[tex]Concentration=(i)*(M)\\Concentration= (3)*(0,10)\\Concentration=0,30[/tex]
c. 0,15 M [tex]Ba(NO_{3})_{2}[/tex]
1. The dissolution of Barium Nitrate can be represented by the following equation:
[tex]Ba(NO_{3})_{2}\rightarrow Ba^{+2}(ac)+2NO_3^{-1}(ac)[/tex], so we have 3 particles (ions)
2. Replacing the value of 3 particles in the following formula:
[tex]Concentration=(i)*(M)\\Concentration= (3)*(0,15)\\Concentration=0,45[/tex]
d. 0.20M[tex]C_2H_6O_2[/tex];
Ethylene Glycol is a nonelectrolyte instead it is molecular compound. These compounds are formed by nonmetals, they can dissolve in water, but they don’t dissociate in the solution they stay intact, so then i=1 and the concentration of the particles is (0,20)(1)= 0,20.
e. 0.10M [tex]Fe(NO_{3})_{3}[/tex]
1. The dissolution of Ferric Nitrate can be represented by the following equation
[tex]Fe(NO_{3})_{3}\rightarrow Fe^{+3}(ac)+3NO_3^{-}(ac)[/tex], so we have 4 particles (ions),
2. Replacing the value of 4 particles in the following formula:
[tex]Concentration=(i)*(M)\\Concentration= (4)*(0,10)\\Concentration=0,4[/tex]
Result: The solution 0.20M[tex]C_2H_6O_2[/tex] will have the lowest boiling point it has the lowest concentration of ions.
