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
Komok [63]
3 years ago
5

A solution contains 15.27 grams of NaCl in 0.670 kg water at 25 °C. What is the vapor pressure of the solution?

Chemistry
2 answers:
Anvisha [2.4K]3 years ago
5 0

Answer:

The vapor pressure of the solution is 23.636 torr

Explanation:

P_{solution} = X_{solvent}*P_{solvent}

Where;

P_{solution is the vapor pressure of the solution

X_{solvent is the mole fraction of the solvent

P_{solvent is the vapor pressure of the pure solvent

Thus,

15.27 g of NaCl = [(15.27)/(58.5)]moles = 0.261 moles of NaCl

0.67 kg of water =  [(0.67*1000)/(18)]moles = 37.222 moles of H₂O

Mole fraction of solvent (water) = (number of moles of water)/(total number of moles present in solution)

Mole fraction of solvent (water) = (37.222)/(37.222+0.261)

Mole fraction of solvent (water) = 0.993

<u>Note:</u> the vapor pressure of water at 25°C is 0.0313 atm

Therefore, the vapor pressure of the solution = 0.993 * 0.0313 atm

the vapor pressure of the solution = 0.0311 atm = 23.636 torr

Leona [35]3 years ago
3 0

Answer:

0.0310 atm.

Explanation:

The vapor pressure of water at 25°C is 0.0313 atm.

Number of moles:

NaCl

Number of moles = mass/molar mass

Molar mass of NaCl = 23 + 35.5

= 58.5 g/mol.

Moles = 15.27/58.5

= 0.26 mol.

Water:

Molar mass = (1*2) + 16

= 18 g/mol

Number of moles = mass/molar mass

= 670/18

= 37.22 mol.

Using Raoult's law,

Mathematically,

Psol = Xsolv * P°solv

Where

Psol = vapour pressure of the solution

Xsolv = mole fraction of the solvent, water.

P°solv = vapour pressure of the solvent, water

Mole fraction of a substance in a solution is the ratio of its moles by the total number of moles in the solution.

Xa = moles of a/(moles of (a+b)

Xwater = 37.22/0.26+37.22

= 0.993

Psol = 0.993 * 0.0313

= 0.0310 atm

You might be interested in
What is an organic chemical?
andriy [413]

Answer:

B is correct answer ...

8 0
3 years ago
Argon, which comprises almost 1 percent of the atmosphere, is approximately 27 times more abundant than CO2 but does not contrib
kykrilka [37]

B. Argon's vibrational energy is not excited by infrared radiation.

Explanation:

The property of carbon dioxide to get excited by infrared electromagnetic radiation is what qualifies it as a greenhouse gas. When infrared from the earth's surface is reflecting back to space, some of the radiation is absorbed and remitted by the carbon-dioxide molecules in the atmosphere. This causes a phenomenon called greenhouse effect that causes the atmosphere to be relatively warmer. The more the carbon dioxide molecules the more the greenhouse effect.

6 0
3 years ago
Match the following terms with their definitions:
Burka [1]
Word-Definition

Pure substance- 4
Matter- 2
Atom- 1
Molecule- 3
Element- 5
4 0
3 years ago
Can isotopes have different atomic numbers
Tpy6a [65]

Answer:

No

Explanation:

Atomic number represents the identity of atoms

using number of protons which is equal in isotopes.

6 0
3 years ago
People who work with radioactive materials often wear a _________ to reveal how much radiation they have been exposed to. A. fil
nekit [7.7K]
People who work with radioactive materials often wear a film badge to reveal how much radiation they have been exposed to. The film badge dosimeter or the film badge is a dosimeter worn by these people working with materials that are radioactive for the purpose of monitoring cumulative radiation dose due to ionizing radiation. The badge has two parts; the photographic film, and a holder.  
3 0
3 years ago
Read 2 more answers
Other questions:
  • Scientists infer that early North American humans hunted the mastodon. Carbon-14 dating of the rib bone indicates that 2.4 half-
    12·1 answer
  • Which of the following is most likely the distance between two places on Earth?
    7·2 answers
  • What is the ph value of water and salt?
    5·1 answer
  • Why does summer receive more daylight hours than winter
    11·2 answers
  • a sample of water is mixed with a surfactant what will most likely happen to the viscosity of the water
    14·2 answers
  • Which molecule will form a solution with a very low pH?<br><br> H3PO4<br> H2O<br> NaOH<br> KOH
    15·2 answers
  • In the Sandwiches mode, select the "Cheese" option and observe the equation given for the preparation of a cheese sandwich. When
    12·1 answer
  • Does anyone know how to do this?
    6·1 answer
  • Net ionic equation for Calcium hydroxide reacting with ammonium Chloride?
    14·1 answer
  • What volume of a 3.95 M
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!