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
AleksAgata [21]
3 years ago
10

Ice cream is made by freezing a liquid mixture that, as a first approximation, can be considered a solution of sucrose in water.

Estimate the temperature at which the first ice crystals begin to appear in a mix that consists of 34% (by mass) sucrose in water. As ice crystallizes out, the remaining solution becomes more concentrated. What happens to its freezing point?
Chemistry
1 answer:
hjlf3 years ago
6 0

Answer:

Freezing point is -2.81°C

Explanation:

34g/342gmol^-1 = 0.0994mol

n = m/mr

Molarity= 0.994/ 0.66 = 1.51M

◇T = -i × m ×Kf

Where ◇T is freezing depression

i= Vant Hoff factor

m = molarity

Kf = freezing content = 1.

860kgmol^-1

◇T =-1 × 1.51 × 1.860 = - 2.81°C

You might be interested in
8. Which of the following statements about noble gases is correct?
Tanya [424]

Answer:

C.

Explanation:

Noble gases are stable and already have a full outter shell therefore don't tend to lose or gain any electrons.

8 0
3 years ago
Lisa studied the role of the stamen and stigma in the formation of seeds in flowering plants. She removed all the stamen from on
gulaghasi [49]
The Answer is Tweezers!
4 0
3 years ago
Read 2 more answers
Help please please help please
Anni [7]

Answer:

I don't fully understand what this is about...

Explanation:

sorry :(

5 0
3 years ago
Read 2 more answers
In the laboratory you dissolve 13.9 g of potassium phosphatein a volumetric flask and add water to a total volume of 250mL.
tensa zangetsu [6.8K]

Answer:

Molarity of the solution? 0,262 M.

Concentration of the potassium cation? 0,786 M.

Concentration of the phosphate anion? 0,262 M.

Explanation:

Potassium phosphate (K₃PO₄; 212,27 g/mol) dissolves in water thus:

K₃PO₄ → 3 K⁺ + PO₄³⁻ <em>(1)</em>

Molarity is an unit of chemical concentration given in moles of solute (K₃PO₄) per liters of solution.

There are 250 mL of solution≡0,25 L

The moles of K₃PO₄ are:

13,9 g of K₃PO₄ ×\frac{1mol}{212,27 g} = 0,0655 moles of K₃PO₄

The molarity of the solution is:

\frac{0,0655 moles}{0,25L} = 0,262 M

In (1) you can see that 1 mole of K₃PO₄ produces 3 moles of potassium cation. The moles of potassium cation are:

0,0655 moles×3 = 0,1965 moles

The concentration is:

\frac{0,1965 moles}{0,25L} = 0,786 M

The moles of K₃PO₄ are the same than moles of PO₄³⁻, thus, concentration of phosphate anion is the same than concentration of K₃PO₄. 0,262 M

I hope it helps!

4 0
3 years ago
A gas takes up a volume of 10 liters, has a pressure of 7.5 atm, and a
Y_Kistochka [10]

Answer:

I’m trying to do something similar to that

Explanation:

3 0
3 years ago
Other questions:
  • Which of the following are chemicals?<br> clothing<br> food<br> fuels<br> all of the above
    7·1 answer
  • How does boyle's law relate to breathing?
    6·1 answer
  • Be sure to answer all parts. the average atomic mass of nitrogen is 14.0067. the atomic masses of the two stable isotopes of nit
    12·1 answer
  • Water (3030 g ) is heated until it just begins to boil. If the water absorbs 5.49×105 J of heat in the process, what was the ini
    10·1 answer
  • Rank the following photons in terms of increasing energy: (a) blue (λ = 453 nm); (b) red (λ = 660 nm); (c) yellow (λ = 595 nm).
    13·1 answer
  • A chemist wants to calculate the amount of heat that is absorbed by a sample of copper as it is melted. Which constant should sh
    15·2 answers
  • Pls answer 24 and 26.pls explain
    8·1 answer
  • In the diagram, which letter is altered by a catalyst? <br><br> A<br> B<br> C<br> D
    8·1 answer
  • Select the correct answer.
    6·2 answers
  • Which statement best describes a chemical change?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!