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
Lelechka [254]
3 years ago
12

The following solutions are prepared by dissolving the requisite amount of solute in water to obtain the desired concentrations.

Rank the solutions according to their respective osmotic pressures in decreasing order assuming the complete dissociation of ionic compounds.
Rank from highest to lowest osomotic pressure.
a) 1 M CaCl2
b) 2 M CH3OH
c) 1 M C6H12O6
d) 1 M LiCl
Chemistry
1 answer:
Mama L [17]3 years ago
3 0

Answer:

CaCl₂ > CH₃OH = LiCl > C₆H₁₂O₆

Explanation:

The osmotic pressure of a compound is calculated using the following expression:

π = MRT (1)

This expression is used when the substance is nonelectrolyte. If the solution is electrolyte solution then we need to count the van't hoff factor into the expression so:

π = MRTi  (2)

Now, we have 4 solutions here, only two of them are electrolyte solution, this means that these solutions can be dissociated into separate ions. These solutions are LiCl and CaCl₂. It can be shown in the following reactions:

LiCl -------> Li⁺ + Cl⁻     2 ions   (i = 2)

CaCl₂ ---------> Ca²⁺ + 2Cl⁻      3 ions (i = 3)

The methanol (CH₃OH) and glucose (C₆H₁₂O₆) are non electrolyte solutions, therefore they are not dissociated. So, let's use expression (1) for methanol and glucose, and expression (2) for the salts:

CaCl₂:   π = 1 * 3 * RT = 3RT

CH₃OH:   π = 2 * RT = 2RT

C₆H₁₂O₆:  π = 1 * RT = 1RT

LiCl: π = 1 * 2 * RT = 2RT

Finally with these results we can conclude that the decreasing order of these solutions according to their osmotic pressures are:

<h2>CaCl₂ > CH₃OH = LiCl > C₆H₁₂O₆</h2>
You might be interested in
13. What is the frequency of a wave that has a wavelength of 2.73 x 10-7m?​
ella [17]

Answer:

f = 1.09 × 10¹⁵ Hz

Explanation:

Given data:

Frequency of wave = ?

Wavelength of wave = 2.73 ×10⁻⁷ m

Solution:

Formula:

Speed of light = frequency × wavelength

speed of light = 3× 10⁸ m/s

by putting values,

3× 10⁸ m/s = f × 2.73 ×10⁻⁷ m

f = 3× 10⁸ m/s  / 2.73 ×10⁻⁷ m

f = 1.09 × 10¹⁵s⁻¹

s⁻¹ = Hz

f = 1.09 × 10¹⁵ Hz

4 0
3 years ago
When octane (C8H18) is burned in the presence of oxygen, the yield of products (carbon dioxide and water) is 87%. What mass of c
ahrayia [7]

Answer:

14.5g of CO₂ are produced

Explanation:

The reaction of octane with oxygen is:

C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O

<em>Where 1 mole of octane (Molar mass: 114.23g/mol) reacts with 25/2 moles of O₂ (Molar mass 32g/mol) to produce 8 moles of CO₂ and 9 moles of water.</em>

When 21.0 g of octane is burned with 19.0 g of oxygen gas you need to find <em>limiting reactant </em>to find how many moles of products are formed:

Octane: 21.0g ₓ (1mol / 114.23g) = 0.184 moles octane

Oxygen: 19.0g ₓ (1 mol / 32g) = 0.594 moles oxygen

For a complete reaction of 0.184 moles of octane you will need:

0.184 moles C₈H₁₈ ₓ (25/2 moles O₂ / 1 mole C₈H₁₈) = <em>2.3 moles of oxygen</em>

As you have just 0.594 moles of oxygen, <em>Oxygen is limiting reactant.</em>

Based on chemical equation, 25/2 of O₂ produce 8 moles of CO₂, that means theoretical yield of CO₂ with 0.594 moles of O₂ is:

0.594 moles O₂ ₓ (8 moles CO₂ / 25/2 moles O₂) = 0.380 moles of CO₂

But, as yield of products is 87%, moles produced of CO₂ are:

0.380 moles of CO₂ ₓ 87% = 0.331 moles CO₂ are produced.

As molar mass of CO₂ is 44g/mol, mass of CO₂ in 0.331 moles is:

0.331 moles CO₂ ₓ (44g / mol) =

<h3>14.5g of CO₂ are produced</h3>
6 0
3 years ago
What is an enzyme? Please help.
poizon [28]
An enzyme is a catalyst that helps speed up a chemical reaction.
8 0
3 years ago
Read 2 more answers
Which statement regarding the second law of thermodynamics is true?
GREYUIT [131]
The Second Law of Thermodynamics<span> says that processes that involve the transfer or conversion of heat energy are irreversible.</span><span> ... The First </span>Law of Thermodynamics<span> states that energy cannot be created or destroyed; the total quantity of energy in the universe stays the same.</span>
4 0
3 years ago
Which of the following shows the valency of 1?
Oliga [24]

\huge \bf༆ Answer ༄

The element having valency of 1 is ~

  • Sodium (Na)
6 0
2 years ago
Read 2 more answers
Other questions:
  • PLEASE HELP ASAP!!! 25 POINTS AND BRAINLIEST FOR FASTEST AND BEST ANSWER!!!
    12·1 answer
  • What does hydraulic power used to produce electricity
    7·1 answer
  • Why does SO2 and water make H2SO3 and NOT H2SO4? Explain your answer.
    8·1 answer
  • 15. An apparatus consists of a 4.0 dm3
    14·2 answers
  • Which property of ionic bonds is illustrated on the right? What other physical properties does this structure affect?
    5·1 answer
  • Which of these is a physical factor that can influence the amount of plant life that can grow in an ecosystem? A. Plant-eating a
    7·2 answers
  • What is the freezing point of a solution of 0.500 mol of sucros in 500.0 mL of water?
    13·1 answer
  • Which factors will result in a stronger ionic bond overall?a. larger ions b. similarity of ionic sizes c. greater absolute charg
    8·1 answer
  • The layer of skin that forms the fingerprint is called the
    8·2 answers
  • A 4.16L balloon filled with gas is warmed from 251.5K to 298.4 K. What is the volume of the gas after it is heated?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!