Chemistry, 23.01.2020 18:31 danielacortevpe3i66

Raoult's law accounts for the fact that the vapor pressure of a solvent will decrease as the mole fraction of the solvent is decreased. in considering the mole fraction, it is important to consider the total moles of dissolved particles. remember: a particle can be a dissolved molecule or ion. which aqueous solutions would have the lowest vapor pressure

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Answer from: bryn2433

Raoult's law accounts for the fact that the vapor pressure of a solvent will decrease as the mole fraction of the solvent is decreased. In considering the mole fraction, it is important to consider the total moles of dissolved particles. Remember: a particle can be a dissolved molecule or ion. Which aqueous solutions would have the lowest vapor pressure.

0.1 M NH_4NO_3(aq) , 0.1 M NaF(aq) , 0.1 M LiNO_3(aq) , 0.1 M Na_3PO_4(aq) and 0.1 M HC_2H_3O_2(aq)

0.1 M Na_3PO_4

Explanation:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

$\frac{p^o-p_s}{p^o}=i\times x_2$

where,

$\frac{p^o-p_s}{p^o}$ = relative lowering in vapor pressure

i = Van'T Hoff factor

x_2 = mole fraction of solute

1. For 0.1 M NH_4NO_3

$NH_4NO_3\rightarrow NH_4^{+}+NO_3^{-}$

, i= 2 as it is a electrolyte and dissociate to give 2 ions. and concentration of ions will be $1\times 0.1+1\times 0.1=0.2$

2. For 0.1 M NaF

$NaF\rightarrow Na^{+}+F^{-}$

, i= 2 as it is a electrolyte and dissociate to give 2 ions, concentration of ions will be $1\times 0.1+1\times 0.1=0.2$

3. For 0.1 M LiNO_3

$LiNO_3\rightarrow Li^{+}+NO_3^{-}$

, i= 2 as it is a electrolyte and dissociate to give 2 ions. and concentration of ions will be $1\times 0.1+1\times 0.1=0.2$

4. For 0.1 M Na_3PO_4

$Na_3PO_4\rightarrow 3Na^{+}+PO_4^{3-}$

, i= 4 as it is a electrolyte and dissociate to give 4 ions. and concentration of ions will be $3\times 0.1+1\times 0.1=0.4$

5. For 0.1 M HC_2H_3O_2(aq)

$HC_2H_3O_2(aq)\rightarrow CH_3COO^{-}+H^{+}$ [/tex]

, i= 2 as it is a electrolyte and dissociate to give two ions, concentration of ions will be $2\times 0.1=0.2$

Thus as concentration of solute is highest for 0.1 M Na_3PO_4 , the vapor pressure will be lowest.

Answer from: Quest

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .

Answer from: Quest

b. is the answer hoped i

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Raoult's law accounts for the fact that the vapor pressure of a solvent will decrease as the mole fr...