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
mihalych1998 [28]
3 years ago
15

1. A sample of polystyrene is found to have a number-average molar mass of 89,440 g mol−1 . Neglecting contributions from end gr

oups, calculate the number-average degree of polymerization of this sample. Assuming that the sample has a molar mass dispersity of 1.5, calculate its weight-average molar mass.
Chemistry
1 answer:
Snowcat [4.5K]3 years ago
8 0

Answer:

The weight-average molar mass of polystyrene is 134,160 g/mol.

Explanation:

Molar mass of the monomer styrene , C_8H_8, M=104 g/mol

Given , number average molar mass of the polymer , M'= 89,440 g/mol

Degree of polymerization = n

n=\frac{M'}{M}=\frac{89,440 g/mol}{104 g/mol}=860

The weight-average molar mass = M_{avg}=?

Molar mass dispersity is ratio of weight-average molar mass to the number average molar mass of the polymer.

\text{Molar mass dispersity}=\frac{M_{avg}}{M'}

1.5=\frac{M_{avg}}{89,440 g/mol}

M_{avg}=89,440 g/mol\times 1.5 = 134,160 g/mol

The weight-average molar mass of polystyrene is 134,160 g/mol.

You might be interested in
Endorphins are generated in the body during exercise, which leads to better emotional health. Please select the best answer from
Lostsunrise [7]

Answer: Yes the statement is true.

Explanation: Endorphins are chemicals produced by the human bodies to relieve stress and pain.

They are produced mainly by brain and help to transmit electrical signals within nervous system, thus are called as neurotransmitters.

They are also called as "feel good chemicals" as they can act as pain relievers and happiness booster and thus lead to better emotional health.

7 0
3 years ago
Read 2 more answers
At 25.5°C a gas has a volume of 125mL. What would be the volume be if the temperature increased to 50°C
kolezko [41]

Answer:

245 mL

Explanation:

Please see the step-by-step solution in the picture attached below.

Hope this answer can help you. Have a nice day!

7 0
3 years ago
The first law of thermodynamics is observed when
krek1111 [17]

Answer:

Explanation:

The first law of Thermodynamics is known as Conservation because it explains that energy is always maintained within a closed system and cannot be created or destroyed. Therefore, this is observed when there is no longer change in temperature in a system. Mainly because the energy is not being transferred to and from another system. Without this transfer of energy, the energy itself gets conserved within the system and the temperature no longer fluctuates.

8 0
2 years ago
What property of water allows it to stick to a dry surface
son4ous [18]
You are looking for ADHESION
4 0
3 years ago
Explain what a chromosome is in your own words.
Alex787 [66]
It’s a structure of nucleic acids and protein that can be found in the nucleus; it carries genetic information through genes
7 0
3 years ago
Read 2 more answers
Other questions:
  • The proprietor of a rock shop insists that a nugget is pure gold. if the nugget occupies a volume of 5.40 ml, what would its mas
    12·1 answer
  • At 25.0∘c, the molar solubility of barium chromate in water is 1.10×10−5 m . calculate the solubility in grams per liter.
    6·1 answer
  • This type of triglyceride contains more than one double bond in the fatty acid carbon atoms
    15·1 answer
  • Is potassium a metal, non metal or metalliod
    9·1 answer
  • What does geotropism enable plants to do
    9·1 answer
  • In the oxidation of iron; how many grams of iron (III) oxide will be produced from 6.20 mol of Fe?
    6·1 answer
  • 7.95 x 1022<br> 6.02 x 1023
    9·1 answer
  • Identify the number of core and valence electrons for each atom.
    8·1 answer
  • Help me pLSSSSSSSSSSSSSSS​
    15·2 answers
  • What happens to the following system at equilibrium when it experiences an increase or a decrease in temperature?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!