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
jenyasd209 [6]
3 years ago
10

Cyclohexane has a freezing point of 6.50 ∘C and a Kf of 20.0 ∘C/m. What is the freezing point of a solution made by dissolving 0

.617 g of biphenyl (C12H10) in 25.0 g of cyclohexane? Express the temperature numerically in degrees Celsius.
Chemistry
1 answer:
sdas [7]3 years ago
8 0

Answer:

Temperature of freezing for the solution is. 3.3°C

Explanation:

This is an excersise of coligative property (freezing low depression)

ΔT = Kf . m

Mass of solute (biphenyl) → 0.617 g

Mass of solvent (cycloexane) → 25 g

m = molality (mol of solute in 1kg of solvent)

Let's find out moles of solute:

Moles = Mass / Molar mass

Moles = 0.617 g / 154 g/m → 0.004 moles

To know molalilty, let's convert 25 g to kg

25 g = 0.025 kg

moles / kg = molality

0.004 m / 0.025 kg = 0.16m

ΔT = T°freezing pure solvent  - T° freezing solution

6.5°C - T° freezing solution  = 20°C/m . 0.16m

6.5°C - T° freezing solution = 3.20°C

6.5°C - 3.20°C = T° freezing solution → °3.3 °C

You might be interested in
Which sphere forms Earth's outermost layer?
svetoff [14.1K]

Answer: I believe the answer is A.

Explanation: Well, the lithosphere is rocks and earth, the hydrosphere makes up all the water on Earth, the biosphere is us, (living things,) and the atmosphere is the air that surrounds us and our planet. So if you go in order, it's basically lithosphere, hydrosphere, biosphere, and then atmosphere.

7 0
2 years ago
PLEASE HELP ASAP!!!!! WILL GIVE BRAINLIEST TO FIRST CORRECT ANSWER
Sunny_sXe [5.5K]

Answer:

Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons

Hope that helps!

7 0
3 years ago
Read 2 more answers
When light waves pass through solids, the speed of the wave ___________.
bearhunter [10]

Answer:

i think that the answer is that it would decrease

Explanation:

hope this helps

sorry if the answer is wrong

8 0
2 years ago
calculate how many milliliters of 0.142 M NaOH are needed to completely neutralize 21.4 mL of 0.294 M H2C4H4O6.
Flura [38]

Answer:

The answer to your question is 88.7 ml

Explanation:

Data

Volume = ?

Concentration of NaOH = 0.142 M

Volume of H₂C₄H₄O₆ = 21.4 ml

Concentration of H₂C₄H₄O₆ = 0.294 M

Balanced chemical reaction

               2 NaOH + H₂C₄H₄O₆  ⇒  Na₂C₄H₄O₆  +  2H₂O

1.- Calculate the moles of H₂C₄H₄O₆

Molarity = moles/volume

Solve for moles

moles = Molarity x volume

Substitution

moles = 0.294 x 21.4/1000

Result

moles = 0.0063

2.- Use proportions to calculate the moles of NaOH

              2 moles of NaOH ------------------ 1 moles of H₂C₄H₄O₆

               x                           ------------------ 0.0063 moles

               x = (0.0063 x 2) / 1

               x = 0.0126 moles of NaOH

3.- Calculate the volume  of NaOH

Molarity = moles / volume

Solve for volume

Volume = moles/Molarity

Substitution

Volume = 0.0126/0.142

Result

Volume = 0.088 L or 88.7 ml

3 0
3 years ago
1. Which of the following parts allow different activities of the cell to happen? A cytoplasm C vacuole B. lysosome D. vesicle 2
Anna35 [415]

Answer: A. Cytoplasm

Explanation: Cytoplasm is a jelly, like material that fills up the remaining space in the cell. It is also responsible in making the shape of the cell. Without it, other parts of the cells or the organelles cannot make its function because it serves as the hallway of the transportation of the nutrients needed by each cell.

Learn more: https://brainly.ph/question/73078

4 0
2 years ago
Other questions:
  • Why do we use anhydrous diethyl ether? Choose the right answer.
    11·1 answer
  • Balance the reactions which form ions. Choose "blank" if no other coefficient is needed. Writing the symbol implies "1."
    13·2 answers
  • Ionic bonds form as a result of the electrostatic attraction between
    15·1 answer
  • 5. Rosalind Franklin was a key figure in the discovery of the structure of DNA, yet she
    15·1 answer
  • The solubility of AgNO3 at 10° and 20°C are 170g and 222g per 100g H2O. What is the sign of change of heat of solution for AgNO3
    5·1 answer
  • One atom of element A bonds with element E.
    9·1 answer
  • 2 points
    5·1 answer
  • The Earth's Layers
    6·2 answers
  • Calculate the molarity of a Ba(OH)2 solution if 1950 mL is completely titrated by 26.1 mL of 0.505 M HNO3
    12·1 answer
  • What are ways in controlling soil applicable in your community​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!