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
gtnhenbr [62]
3 years ago
5

A solution was prepared by dissolving 40.0 g of kcl in 225 g of water. part a calculate the mass percent of kcl in the solution.

express your answer with the appropriate units. 15.1 {\rm \\%} calculate the mole fraction of the ionic species kcl in the solution.
Chemistry
2 answers:
EleoNora [17]3 years ago
6 0
<h2>  part A : </h2><h2>The mass % of KCl = 17.78 %</h2>

<u>calculation </u>

 mass%= mass  of the solute/mass of the solvent x100

mass of the solute  40 g

mass of the solvent=225

% mass= 40/225 x100=17.78%


<h2>Part B</h2><h3>The mole fraction of ionic species =0.04296</h3>

the mole  fraction=moles of KCl/ moles of the solution

moles of KCl=  40 g/74.5 g/mol=0.537 moles

moles of water  = 225g/18 g/mol=12.5 moles

mole fraction is therefore= 0.537/12.5=0.04296

Alex3 years ago
3 0

Explanation:

(a)   According to the given data, mass of the solution will be calculated as follows.

          Mass of solution = Mass of KCl + Mass of water

                                      = (40 + 225) g

                                      = 265 g

Therefore, (m/m)% of KCl will be calculated as follows.

           (m/m)% of KCl = \frac{\text{mass of KCl}}{\text{mass of solution}} \times 100    

                                   = \frac{40}{265} \times 100

                                   = 15.09%

Hence, mass percent of KCl in the solution is 15.09%.

(b)    Now, we will calculate the mole fraction of ionic species present in KCl  in the solution are follows.

Molar mass of KCl is 74.55 g/mol.

                Moles of KCl = \frac{mass}{\text{molar mass}}

                                      = \frac{40 g}{74.55 g/mol}

                                      = 0.536 mol

or,                                   = 0.54 mol

As, molar mass of water is 18 g/mol. Hence, moles of water will be calculated as follows.

           Moles of H_{2}O = \frac{mass}{\text{molar mass}}

                                      = \frac{225 g}{18 g/mol}

                                      = 12.5 mol

So, total number of moles = moles of KCl + moles of H_{2}O

                                           = (0.54 + 12.5) mol

                                           = 13.04 mol

Calculate the mole fraction of KCl in the solution as follows.

              Mole fraction = \frac{\text{moles of KCl}}{\text{total moles}}

                                     = \frac{0.54 mol}{13.04 mol}

                                     = 0.041

Therefore, mole fraction of the ionic species KCl in the solution is 0.041.

You might be interested in
Why is the increasing amount of carbon dioxide being taken up by the oceans a cause for concern?
Anna007 [38]

Answer;

-More carbon dioxide causes an increase in carbonic acid (H2CO3) which leads to a decrease in the concentration of carbonate ion (CO32-).

Explanation;

-Carbon dioxide is added to the atmosphere whenever people burn fossil fuels. Oceans play an important role in keeping the Earth's carbon cycle in balance.

-As the amount of carbon dioxide in the atmosphere increases, the oceans absorb a lot of it. In the ocean, carbon dioxide reacts with seawater to form carbonic acid which causes the acidity of seawater to increase.

-As long as we keep putting extra carbon dioxide in the atmosphere, the acidity of the ocean will continue to increase. The effect is that; Increasing acidity makes it harder for corals to build skeletons and for shellfish to build the shells they need for protection. Corals are particularly important because they provide homes for many other sea creatures.

7 0
2 years ago
What functional group is aspartic acid
Westkost [7]
The functional group of aspartic acid is -COOH.
8 0
3 years ago
How did earths layers develop?<br>(Science)
Delvig [45]
They all just formed on top of each other like sedimentary rocks
6 0
3 years ago
(2. Which of the following best describes humus?
Harlamova29_29 [7]

Answer:

A. Decomposed organic matter

Explanation:

6 0
2 years ago
What do tissues combine to form?
elena55 [62]
Answer is D organs because cell forms tissues, tissues form organs and organs forms the organ system
4 0
2 years ago
Read 2 more answers
Other questions:
  • Suppose the liquid water in ice cream did not have solutes dissolved in it. What effect do you think this would have on ice crea
    5·1 answer
  • Write a sentence that descrices how to determine the number of moles of a compound in known mass of a
    14·1 answer
  • Which of the following is not true of acids?
    11·1 answer
  • Individuals within populations exhibit some diversity. As a result of possessing slightly different traits, some individuals are
    12·2 answers
  • A block of aluminum occupies a volume of 0.015 L and has a mass of 40.5 g. What is its density
    6·1 answer
  • What is the one variable that is changed in the experimental group called? the placebo the independent variable the control grou
    8·1 answer
  • Checking if my answer is correct: I got LARQY, but I'm pretty sure it's wrong. Can somebody please help?
    11·1 answer
  • Some chemical changes can be ______________ through another _______________ change.
    8·1 answer
  • Rotation is the spin of a body on its axis. Revolution is the movement of one body around another in an ellipse-shaped path call
    13·1 answer
  • I need help asap please help me
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!