1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
s344n2d4d5 [400]
3 years ago
14

Calculate the freezing point of the solution containing 0.105 m k2s. calculate the boiling point of the solution above. -g

Chemistry
2 answers:
sdas [7]3 years ago
6 0

Answer :

The freezing point of a solution is -0.586^oC

The boiling point of a solution is 100.2^oC

Explanation :

First we have to calculate the freezing point of solution.

Formula used :  

\Delta T_f=i\times K_f\times m\\\\T^o-T_s=i\times K_f\times m

where,

\Delta T_f = change in freezing point

\Delta T_s = freezing point of solution = ?

\Delta T^o = freezing point of water = 0^oC

i = Van't Hoff factor = 3 (for K₂S electrolyte)

K_f = freezing point constant for water = 1.86^oC/m

m = molality  = 0.105 m

Now put all the given values in this formula, we get

0^oC-T_s=3\times (1.86^oC/m)\times 0.105m

T_s=-0.586^oC

Thus, the freezing point of a solution is -0.586^oC

Now we have to calculate the boiling point of solution.

Formula used :  

\Delta T_b=i\times K_f\times m\\\\T_s-T^o=i\times K_b\times m

where,

\Delta T_b = change in boiling point

\Delta T_s = boiling point of solution = ?

\Delta T^o = boiling point of water = 100^oC

i = Van't Hoff factor = 3 (for K₂S electrolyte)

K_b = boiling point constant for water = 0.51^oC/m

m = molality  = 0.105 m

Now put all the given values in this formula, we get

T_s-100^oC=3\times (0.51^oC/m)\times 0.105m

T_s=100.2^oC

Thus, the boiling point of a solution is 100.2^oC

Licemer1 [7]3 years ago
5 0
Quantity of K2S m = 0.105 m 
Number of ions i = 2(K) + 1(S) = 3
 Freezing point depression constant of water Kf = 1.86 
delta T = i x m x Kf = 3 x 0.105 x 1.86 = 0.586
 Freezing point = 0 - 0.586 = 0.586 C
 Boiling point constant of water Kb = 0.512
 delta T = i x m x Kb = 3 x 0.105 x 0.512 = 0.161
 Boiling point = 100 + 0.161 = 100.161 C
You might be interested in
How many liters of solution will contain 1.5 moles of CaCl2 if the solution is 6.0 M CaCl2?
sashaice [31]

Answer:

0.25

Explanation:

volume= number of moles over concentration

hence v=1.5/6

6 0
3 years ago
Suppose that some FeSCN2+ is added to the above solution to shift the equilibrium. When equilibrium is re-established, the follo
kiruha [24]

Explanation:

The given reaction equation will be as follows.

          [FeSCN^{2+}] \rightleftharpoons [Fe^{3+}] + [SCN^{-}]

Let is assume that at equilibrium the concentrations of given species are as follows.

        [Fe^{3+}] = 8.17 \times 10^{-3} M

        [SCN^{-}] = 8.60 \times 10^{-3} M

        [FeSCN^{2+}] = 6.25 \times 10^{-2} M

Now, first calculate the value of K_{eq} as follows.

     K_{eq} = \frac{[Fe^{3+}][SCN^{-}]}{[FeSCN^{2+}]}

              = \frac{8.17 \times 10^{-3} \times 8.60 \times 10^{-3}}{6.25 \times 10^{-2}}

              = 11.24 \times 10^{-4}

Now, according to the concentration values at the re-established equilibrium the value for [FeSCN^{2+}] will be calculated as follows.

             K_{eq} = \frac{[Fe^{3+}][SCN^{-}]}{[FeSCN^{2+}]}

        11.24 \times 10^{-4} = \frac{8.12 \times 10^{-3} \times 7.84 \times 10^{-3}}{[FeSCN^{2+}]}

         [FeSCN^{2+}] = 5.66 \times 10^{-2} M

Thus, we can conclude that the concentration of [FeSCN^{2+}] in the new equilibrium mixture is 5.66 \times 10^{-2} M.

7 0
3 years ago
How do molecules appear in gas
lora16 [44]
Loosely or widely spaced
7 0
3 years ago
Read 2 more answers
A force of 20 N acts upon 5 kg block caculate the accerleration of the object
Vedmedyk [2.9K]

Answer:

\boxed{\text{4 m $\cdot$ s$^{-2}$}}

Explanation:

F = ma

a = \dfrac{F}{m} = \dfrac{\text{20 N}}{\text{5 kg}} \times \dfrac{\text{1 kg$\cdot$ m $\cdot$ s$^{-2}$}}{\text{1 N}} = \text{4 m $\cdot$ s$^{-2}$}\\\\\text{The acceleration of the object is } \boxed{\textbf{4 m $\cdot$ s$^{\mathbf{-2}}$}}

 

4 0
3 years ago
Hich statement describes the process of fusion, but not the process of fission?
lesantik [10]

The answer is A. this process is only in the research phase

The process of fusion involves merging of atomic nuclei to form heavier nuclei resulting in the release of enormous amounts of energy. Fusion takes place when two low mass isotopes, typically isotopes of hydrogen, unite under conditions of extreme pressure and temperature. Scientists continue to work on controlling nuclear fusion in an effort to make a fusion reactor to produce electricity. However, progress is slow due to challenges with understanding how to control the reaction in a contained space.






4 0
3 years ago
Other questions:
  • How many moles of oxygen gs react with 3.8 moles of hydrogen to form water?
    15·1 answer
  • Which is evidence that the reaction below is a redox reaction?
    5·2 answers
  • Which part of atom determine the identity of a atom
    11·1 answer
  • Which of these is NOT a point of the Kinetic-Molecular theory?
    11·1 answer
  • Is a instant cold pack Endothermic or Exothermic reaction? Explain.
    14·1 answer
  • Cu2O + C-&gt;<br> Cu + CO2<br> Balance the above reaction by writing in the correct coefficient.
    10·2 answers
  • 3. Why do gases deviate from the ideal gas law at high pressures? A. Molecules have finite volume. B. Cohesive forces increase t
    14·1 answer
  • Which choice describes the function of the pancreas gland?
    8·1 answer
  • HELP!!! A nuclear engineer is designing a nuclear reactor for a new power plant. The reactor core will have an operating tempera
    13·1 answer
  • Which of the following best describes of a loan soil
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!