Chemistry, 01.09.2019 08:30 hhcfg

Which of the following aqueous solutions will have the lowest vapor pressure at 25 degrees celsius?
a. 1.0 m ch4
b. 1.0 m nacl
c. 1.0 m alcl3
d. 1.0 m bacl2

Answers: 1

Show answers

Answers

Answer from: mashejaj

The choices experiences colligative properties. These set of properties depend on the amount of solute dissolved in a solvent. These properties include freezing point depression, boiling point elevation, osmotic pressure and vapor pressure lowering. From the choices, the correct answer is A.

Answer from: ddllww369

Answer : The correct option is, (C) 1.0 M AlCl_3

Explanation :

According to the relative lowering of vapor pressure, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component of the solution multiplied by the vapor pressure of that component in the pure state.

1.0 M means that the 1.0 moles of solute present in 1 liter of solution.

Formula used :

$\frac{\Delta p}{p^o}=i\times X_B$

where,

p^o = vapor pressure of the pure component (water)

p_s = vapor pressure of the solution

X_B = mole fraction of solute

i = Van't Hoff factor

As we know that the vapor pressure depends on the mole fraction of solute and the Van't Hoff factor.

So, the greater the number of particles of solute dissolved the lower the resultant vapor pressure.

(a) The dissociation of 1.0 M CH_4 is not possible because it is a non-electrolyte solute. So, the Van't Hoff factor will be, 1.

(b) The dissociation of 1.0 M NaCl will be,

$NaCl\rightarrow Na^++Cl^-$

So, Van't Hoff factor = Number of solute particles = Na^++Cl^- = 1 + 1 = 2

$AlCl_3\rightarrow Al^{3+}+3Cl^{-}$

So, Van't Hoff factor = Number of solute particles = $Al^{3+}+3Cl^{-}$ = 1 + 3 = 4

$BaCl_2\rightarrow Ba^{2+}+2Cl^{-}$

So, Van't Hoff factor = Number of solute particles = $Ba^{2+}+2Cl^{-}$ = 1 + 2 = 3

From this we conclude that, 1.0 M AlCl_3 has the highest Van't Hoff factor which means that the solution will exhibit the lowest vapor pressure.

Hence, the correct option is, (C) 1.0 M AlCl_3

Answer from: Quest

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

Answer from: Quest

a is the answer to this question

explanation:

Another question on Chemistry

Chemistry, 22.06.2019 04:20

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Answers: 1

Answer

Chemistry, 22.06.2019 06:00

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

Answers: 3

Answer

Chemistry, 22.06.2019 09:40

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need

Answers: 2

Answer

Chemistry, 22.06.2019 10:20

In a reaction equation, where are the products located? a.) above the arrow b.) to the right of the arrow c.) to the left of the arrow d.) below the arrow

Answers: 2

Answer

You know the right answer?

Which of the following aqueous solutions will have the lowest vapor pressure at 25 degrees celsius?...

Questions