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
valina [46]
3 years ago
8

What is the boiling point of an aqueous solution that has a vapor pressure of 23.0 torr at 25 ∘C? (P∘H2O=23.78 torr; Kb= 0.512 ∘

C/m).
Chemistry
1 answer:
UNO [17]3 years ago
5 0

Answer:

Boiling point of the solution is 100.964°C

Explanation:

In this problem, first, you must use Raoult's law to calculate molality of the solution. When you find the molality you can obtain the boiling point elevation because of the effect of the solute in the solution (Colligative properties).

Using Raoult's law:

Psol = Xwater × P°water.

As vapour pressure of the solution is 23.0torr and for the pure water is 23.78torr:

23.0torr= Xwater × 23.78torr.

0.9672 = Xwater.

The mole fraction of water is:

0.9672 = \frac{X_{H_2O}}{X_{H_2O}+X_{solute}}

Also,

1 = X_{H_2O}+X_{solute}

You can assume moles of water are 0.9672 and moles of solute are 1- 0.9672 = 0.0328 moles

Molality is defined as the ratio between moles of solute (0.0328moles) and kg of solvent. kg of solvent are:

09672mol *\frac{18.01g}{1mol}* \frac{1kg}{1000g} = 0.01742kg

Molality of the solution is:

0.0328mol Solute / 0.01742kg = 1.883m

Boiling point elevation formula is:

ΔT = Kb×m×i

<em>Where ΔT is how many °C increase the boiling point regard to pure solvent, Kb is a constant (0.512°C/m for water), m molality (1.883m) and i is Van't Hoff factor (Assuming a i=1).</em>

Replacing:

ΔT = 0.512°C/m×1.882m×1

ΔT = 0.964°C

As the boiling point of water is 100°C,

<h3>Boiling point of the solution is 100.964°C</h3>

<em />

You might be interested in
 A substance has 55.80% carbon, 7.04% Hydrogen, and 37.16% Oxygen. What is it's empirical and molecular formula if it has a mola
hjlf

55.80 C/12= 4.65/2.3225= 2

7.04 H/1= 7.04/2.3225= 3

37.16 O/16= 2.3225/2.3225= 1

Empirical Formula= C2H3O

301.35/43= 7

(C2H3O)7= C14H21O7= Molecular Formula

5 0
3 years ago
Read 2 more answers
Which of the following is composed of many cells?
vodomira [7]

Answer:

Bacteria

Explanation:

8 0
3 years ago
Which of the following elements would form the smallest ionic radius and why?
AnnyKZ [126]

Answer:

Sodium

Explanation:

5 0
2 years ago
A molecule contains five atoms and has a molecular weight of 85 g per mole. the atoms are of elements with atomic numbers 1, 6,
inessss [21]

Answer:

            Dichloromethane

Explanation:

As we know the atomic number given belongs to following elements, i.e.

Atomic #                   Element                      M.Mass

   1                           Hydrogen                    1 g.mol⁻¹

   6                          Carbon                        12 g.mol⁻¹

   17                         Chlorine                      35.5 g.mol⁻¹

Also the molecular formula of Dichloromethane is,

                           =  CH₂Cl₂

Putting molar masses of each element,

                          =  (12)₁  +  (1)₂  +  (35.5)₂

                          =  12  +  2  +  71

                          =  85 g.mol⁺¹

Result:

         Hence the only possible structure containing 5 atoms is Dichloromethane.

6 0
3 years ago
Which of the following prefixes would be best to use when measuring the distance from your home to the store?
Shalnov [3]
I would say the most correct answer is Kilo, as in kilometers. The store would certainly not be milli, or millimeters away from you, would it now? :)

Hope this helps!
4 0
3 years ago
Other questions:
  • How many moles of water are In 44.99 grams
    12·1 answer
  • In a study of the conversion of methane to other fuels, a chemical engineer mixes gaseous CH4 and H2O in a 0.32-L flask at 1200
    15·1 answer
  • Calculate the frequency of the n = 2 line in the Lyman series of hydrogen.
    15·1 answer
  • You have 0.5 L of air in a rigid, sealed container at a pressure of 203 kpa and a temperature or 203 K. You heat the container t
    12·1 answer
  • If a new halogen were discovered with the name sapline and the symbol Sa, how would the following acids of sapline be named?
    14·1 answer
  • When HCl(g) reacts with NH3(g) to form NH4Cl(s) , 176 kJ of energy are evolved for each mole of HCl(g) that reacts. Write a bala
    11·1 answer
  • What is the state of oxygen at -200 degrees celsius
    6·1 answer
  • Hello it's my new id myself numu ​
    10·2 answers
  • How many half-lives are required for the concentration of reactant to decrease to 12. 5% of its original value?.
    8·1 answer
  • A sealed container of N2 gas has a pressure of 836 kPa at 54.7 ∘ C. After it is left out in the sun the pressure increases by 79
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!