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
Kitty [74]
3 years ago
11

What is the vapor pressure of the solution if 35.0 g of water is dissolved in 100.0 g of ethyl alcohol at 25 ∘C? The vapor press

ure of pure water is 23.8 mmHg, and the vapor pressure of ethyl alcohol is 61.2 mmHg at 25 ∘C.
Chemistry
1 answer:
masya89 [10]3 years ago
4 0

<u>Answer:</u> The vapor pressure of the solution is 43.55 mmHg

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}      .....(1)

  • <u>For water:</u>

Given mass of water = 35.0 g

Molar mass of water = 18 g/mol

Putting values in equation 1, we get:

\text{Moles of water}=\frac{35.0g}{18g/mol}=1.944mol

  • <u>For ethyl alcohol:</u>

Given mass of ethyl alcohol = 100.0 g

Molar mass of ethyl alcohol = 46 g/mol

Putting values in equation 1, we get:

\text{Moles of ethyl alcohol}=\frac{100.0g}{46g/mol}=2.174mol

Total moles of solution = [1.944 = 2.174] moles = 4.118 moles

  • Mole fraction of a substance is given by:

\chi_A=\frac{n_A}{n_A+n_B}

<u>For water:</u>

\chi_{\text{water}}=\frac{n_{\text{water}}}{n_{\text{water}}+n_{\text{ethyl alcohol}}}

\chi_{water}=\frac{1.944}{4.118}=0.472

<u>For ethyl alcohol:</u>

\chi_{\text{ethyl alcohol}}=\frac{n_{\text{ethyl alcohol}}}{n_{\text{water}}+n_{\text{ethyl alcohol}}}

\chi_{\text{ethyl alcohol}}=\frac{2.174}{4.118}=0.528

Dalton's law of partial pressure states that the total pressure of the system is equal to the sum of partial pressure of each component present in it.

To calculate the vapor pressure of the solution, we use the law given by Dalton, which is:

P_T=\sum_{i=1}^n (p_i\times \chi_i)

Or,

P_T=[(p_{\text{water}}\times \chi_{\text{water}})+(p_{\text{ethyl alcohol}}\times \chi_{\text{ethyl alcohol}}

We are given:

Vapor pressure of water = 23.8 mmHg

Vapor pressure of ethyl alcohol = 61.2 mmHg

Putting values in above equation, we get:

p_T=[(23.8\times 0.472)+(61.2\times 0.528)]\\\\p_T=43.55mmHg

Hence, the vapor pressure of the solution is 43.55 mmHg

You might be interested in
Which is true about the atomic mass number for elements in the periodic table?
jek_recluse [69]

Answer:

C. Both A & B are true

Explanation:

4 0
3 years ago
What is the molar mass of NH4?
astraxan [27]

Answer:

NH4

Explanation:

7 0
2 years ago
What must happen for an igneous rock to form
Ksenya-84 [330]

Answer:

Igneous Rocks: form by crystallizing melted material (magma).

Explanation:

They can form either on the surface (extrusive igneous rocks), or deep in the crust (intrusive or plutonic igneous rocks).

4 0
2 years ago
The compound below is estradiol, a hormone that triggers the development of female secondary sex characteristics. mc024-1.jpg Es
GrogVix [38]
<span>Estradiol is a type of steroid produced by the ovaries and it is strong that could cause gynecological problems and cancer.</span>
6 0
3 years ago
Read 2 more answers
Which of the following statements about the periodic table's organization is true? (Select all that apply.)
bulgar [2K]
I don't know if it is organized by reactivity
it is organized by families
it is organized by atomic number
it is NOT organized by atomic mass
it is organized by periods and groups
4 0
3 years ago
Read 2 more answers
Other questions:
  • Carbon is often found in long chains composed of carbon and
    9·2 answers
  • What are the two categories of chemical sedimentary rock?
    8·1 answer
  • Which is longer? <br> 1 mile or 1 kilometer
    12·1 answer
  • PLEAASSEEE Explain, really confused
    6·1 answer
  • The element sulfur (S) is most likely to form covalent bonds with the element
    11·2 answers
  • A change in the water temperature of the pacific ocean that produce warm current
    10·1 answer
  • The pH of a solution can be calculated from which of the following expressions?
    9·1 answer
  • Atoms are composed of subtomatic particles called
    8·1 answer
  • Answer correctly for a brainleist! :)
    5·1 answer
  • How does elevation affect the amount of air pressure?”.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!