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
castortr0y [4]
3 years ago
10

A solution containing 8.3 g of a nonvolatile, nondissociating substance dissolved in 1.00 mol of chloroform, CHCl3, has a vapor

pressure of 511 torr. The vapor pressure of pure CHCl3 at the same temperature is 526 torr. Calculate (a) the mole fraction of the solute, (b) the number of moles of solute in the solution, and (c) the molecular mass of the solute.
Chemistry
1 answer:
Margaret [11]3 years ago
7 0

Answer:

a. Xm = 0.0229

b. 0.0234 moles

c. 354.1 g/mol

Explanation:

ΔP = P° . Xm

ΔP = P° - P', where P° is vapor pressure of pure solvent and P', vapor pressure of solution-

This is the formula for lowering vapor pressure.

If we apply the data given: 523 Torr - 511 Torr = 523 . Xm

Xm = ( 523 Torr - 511 Torr) / 523 Torr → 0.0229

Xm = Mole fraction of solute → Moles of solute / Total moles (sv + solute)

We can make this equation to determine moles of solute

0.0229 = Moles of solute / Moles of solute + 1

0.0229 (Moles of solute + 1) = Moles of solute

0.0229 = Moles of solute - 0.0229 moles of solute

0.0229 = 0.9771 moles of solute → 0.0229 / 0.9971 = 0.0234 moles

Molecular mass of solute → g/mol → 8.3 g / 0.0234 mol = 354.1 g/mol

You might be interested in
How many formula units are in<br> 35.0 g KNO3?<br> (KNO3, 101.11 g/mol)<br><br> [?]×10¹²] fun KNO3
alina1380 [7]

mol=35:101.11 g/mol=0.346

formula units = 0.346 x 6.02 x 10²³ = 2.082 x 10²³

3 0
2 years ago
Which term represents the movement of molecules from an area of lower concentration to one of higher concentration with carrier
poizon [28]

Answer:

Active transport

Explanation:

Active transport is defined as the movement of ions or molecules from a region of lower concentration into a region of higher concentration by the use of energy. Two examples of active transport include the uptake of glucose in human intestine and the absorption of mineral ions into plant roots.

Active transport requires energy because it involves the movement of molecules against an existing concentration gradient.

4 0
2 years ago
Why are earthquakes different in New Madrid than in California.
maw [93]
Well it depends how close the places are to the edges of tectonic plates. Also the damage caused from the Earthquakes has to do with how sturdy the buildings are and whether they were built to withhold such strong forces.
5 0
2 years ago
3. What of the following determines an atom's identity?
g100num [7]

Answer:

protons

Explanation:

the number of protons in a nucleus are equal to the number of atoms in an element.

8 0
2 years ago
What factors play a role in the rate at which molecules like O₂ and CO₂ can diffuse?
nadezda [96]

Answer:

The correct answer is b the magnitude of the concentration gradient of the molecule.

Explanation:

Dffusion is one of most important membrane transport process that allow several molecules such as gases oxygen and carbon dioxide to pass directly across the plasma membrane.The is no involvement of  carrier proteins or ion channels during passive diffusion.

    During passive diffusion molecules are transported along their concentration gradient that means from the region of high concentration to region of low concentration,until the concentration of both regions become same.

8 0
3 years ago
Other questions:
  • Help plz i don't know this
    8·1 answer
  • A solution is made by mixing 55.g of thiophene C4H4S and 65.g of acetyl bromide CH3COBr.
    10·1 answer
  • What does density have to do with the cycling of matter in earths interior
    7·1 answer
  • Sample of neon has a volume of 75.8 L at STP? How many miles are present
    8·1 answer
  • A 500.0 mL sample of 0.18 MHClO4 is titrated with 0.27 MCsOH. Determine the pH of the solution after the addition of 250.0 mL of
    8·1 answer
  • Pls help me I don’t understand it’s for my science class.
    10·1 answer
  • A 0.0200 M NaCl solution was formed when 38.0 grams of NaCl was dissolved in
    13·1 answer
  • What is the mass in grams of 8.65 mol C8H18?
    10·1 answer
  • B. The student leaves the beach because a hurricane warning comes in. In a
    13·1 answer
  • Who discovered the proton?<br> Crookes<br> Rutherford<br> Balten<br> Chadwick
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!