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
lesya692 [45]
3 years ago
10

A solution is prepared by mixing 2.17 g of an unknown non-electrolyte with 225.0 g of chloroform. The freezing point of the resu

lting solution is –64.2oC. The freezing point of pure chloroform is – 63.5oC and its kf = 4.68oC m-1. What is the molecular mass of the unknown?
Chemistry
1 answer:
Deffense [45]3 years ago
6 0

Answer:

The molar mass of the unknown non-electrolyte is 64.3 g/mol

Explanation:

Step 1: Data given

Mass of an unknown non-electrolyte = 2.17 grams

Mass of chloroform = 225.0 grams

The freezing point of the resulting solution is –64.2 °C

The freezing point of pure chloroform is – 63.5°C

kf = 4.68°C/m

Step 2: Calculate molality

ΔT = i*kf*m

⇒ ΔT = The freezing point depression = T (pure solvent) − T(solution) = -63.5°C + 64.2 °C = 0.7 °C

⇒i = the van't Hoff factor = non-electrolyte = 1

⇒ kf = the freezing point depression constant = 4.68 °C/m

⇒ m = molality = moles unknown non-electrolyte / mass chloroform

0.7 °C = 1 * 4.68 °C/m * m

m = 0.150 molal

Step 3: Calculate moles unknown non-electrolyte

molality = moles unknown non-electrolyte / mass chloroform

Moles unknown non-electrolyte = 0.150 molal * 0.225 kg

Moles unknown non-electrolyte = 0.03375 moles

Step 4: Calculate molecular mass unknown non-electrolyte

Molar mass = mass / moles

Molar mass = 2.17 grams / 0.03375 moles

Molar mass = 64.3 g/mol

The molar mass of the unknown non-electrolyte is 64.3 g/mol

You might be interested in
When a metal bonds with a nonmetal, the bond that is formed is a(n) ___.
bekas [8.4K]
Ionic Bond, which is the transfer of electrons of a metal to a non-metal. 
5 0
3 years ago
Read 2 more answers
What properties are attributed to a solid with the type of bonding represented in the picture?
Elanso [62]
B it is a cold melting point
6 0
3 years ago
I KNOW THE ANS JUST NEED AN EXPLANATION...PLEASE I WILL Mark you the brainiest
Reika [66]
I’m pretty sure it would be D.
5 0
2 years ago
How do you test for starch in green plant
Sunny_sXe [5.5K]

Answer:

1,Iodine solution is used to test leaves for the presence of starch. ...

2.After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.

3.The leaf on the left is a variegated leaf

Explanation:

4 0
3 years ago
Read 2 more answers
Is sucrose in water an electrolyte
Dafna11 [192]

Answer:

It's false ok it's non electrolyte

3 0
3 years ago
Other questions:
  • For question 9 I need help push or pull
    6·1 answer
  • Draw the product formed by the reaction of t-butoxide with (1r,2s)-1-bromo-2-methyl-1-phenylbutane (shown below). (draw the corr
    10·2 answers
  • A(n) ____________________ is a compound that turns litmus blue and is often found in soaps and detergents.
    5·1 answer
  • What is the second quantum number of a 2s^2 electron in phosphorus,
    5·1 answer
  • Help!! us own words, please!!
    10·1 answer
  • Which statements best describe half-lives of radioactive isotopes? Check all that apply.
    5·2 answers
  • What type of fault usually occurs because of compression?
    5·2 answers
  • Electrophilic aromatic substitution of furan favors addition to the 2-position because the intermediate cation is more stable th
    7·1 answer
  • The color of a star could give hints to<br><br> mass<br> temperature<br> brightness<br> density
    10·2 answers
  • Consider the hypothetical atom x. if the molecular formula for calcium nitrate is ca(no3)2 and the formula of x chloride is xcl2
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!