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
kvv77 [185]
2 years ago
6

The following table lists molecular weight data for a polypropylene material. Molecular Weight Range (g/mol) xi wi

Chemistry
1 answer:
nikklg [1K]2 years ago
3 0

Answer:

a) the number-average molecular weight is 32,400 g/mol

b) the weight-average molecular weight is 36,320 g/mol

c) the degree of polymerization is 770

Explanation:

Given the data in the question;

Molecular                  Mean        Number      Weight      Number        Weight

weight                                                                             average         average

(g/mol)                    Mi(g/mol)         xi                wi          xiMi                  wiMi

8,000-16,000            12,000        0.07           0.03         840                360

16,000-24,000          20,000       0.15           0.09         3000              1800

24,000-32,000         28,000       0.26           0.21          7280              5880

32,000-40,000         36,000       0.27           0.27         9720               9720

40,000-48,000         44,000       0.18            0.28         7920              12320

48,000-56,000         52,000       0.07           0.12          3640              6240

∑                                                                                Mn=32,400     Mw=36,320

so;

a)  the number-average molecular weight

Mn = ∑Mixi

so from the table above; summation of Row Mixi

Mn = ∑Mixi = 32,400

Therefore, the number-average molecular weight is 32,400 g/mol

b) the weight-average molecular weight

Mw = ∑Miwi

so from the table above; summation of Row Miwi

Mw = ∑Miwi = 36,320

Therefore, the weight-average molecular weight is 36,320 g/mol

c) the degree of polymerization

the degree of polymerization of polypropylene can be determined using number-average molecular and repeat unit molecular weight.

now, for polypropylene { CH₂ = CH - CH₃ }

the repeat unit consist of 3 carbon atoms and 6 hydrogen atoms

given that;

Atomic weight of Carbon mC = 12.01 g/mol and

Atomic weight of  Hydrogen mH = 1.008 g/mol

now we find the repeat unit molecular weight of polypropylene

m = nCmC + nHmH

where n is the number of repeat of atoms

so we substitute

m = ( 3 × 12.01) + ( 6 × 1.008)

m = 36.03 + 6.048

m = 42.078 g/mol

now we calculate the degree of polymerization;

DP = Mn / m

so we substitute

DP = 32,400 / 42.078

DP = 769.9985 ≈ 770

Therefore,  the degree of polymerization is 770

You might be interested in
Which statement best describes a difference between electromagnetic waves
9966 [12]

Answer:

C

Explanation:

electronic waves transmits energy but mechanical waves require a medium in order to transport their energy from bgg one place to another.

6 0
2 years ago
Read 2 more answers
A covalent bond forms a(n) ______________.
DiKsa [7]
The answer is Molecule. After a pair of shared electrons orbit around the nuclei of both atoms
3 0
2 years ago
Read 2 more answers
How do you think temperature will affect the rate of a chemical reaction?
Luba_88 [7]

Answer:

I could create a slower reaction because the particles might be moving slower due to the cold. if it was warm there will be a faster reaction. similar to the elements movements in solids and liquids.

8 0
2 years ago
A temperature of 37C is equivalent to a temperature of
ss7ja [257]
Answer 98.6 Fahrenheit
8 0
3 years ago
Read 2 more answers
Is 3Al + 3FeO → 2Al2O3 + 3Fe a balenced or unbalenced equation?
Murrr4er [49]
3f+5=eo got it right
8 0
2 years ago
Other questions:
  • PLEASE HELP I BEG YOU I REALY NEED HELP
    15·2 answers
  • _AgNO3 + _<br> Cu → _<br> Cu(NO3)2 + -<br> Ag
    15·1 answer
  • What is the ideal gas constant?
    12·1 answer
  • An unknown liquid has a mass of 22.1 g
    9·1 answer
  • When elements that form a mineral dissolve in hot water, they form a mixture called a(n) ______.?
    15·1 answer
  • BRAINLIESTTT ASAP!! PLEASE HELP ME :)
    7·1 answer
  • A hydrogen only spectrum
    15·1 answer
  • Calculate the pH of a solution on mixing 0.1 M (50 mL) Ch3cooh and 0.1M(50 mL) Naoh<br>Ka= 0.00005​
    14·1 answer
  • What can do ,when the solution remain in the jet/ nozzle of the pipette?​
    13·1 answer
  • When aqueous magnesium chloride reacts with liquid bromine
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!