What would be the number-average molecular weight of polystyrene obtained at the completion of an anionic...
What would be the number-average molecular weight of
polystyrene obtained at the
completion of an anionic (i.e., “living”) polymerization in which
0.01 g of n-butyllithium and
10 g of styrene monomer are used? The molecular weight of
butyllithium and styrene are
64.06 and 104.12, respectively.
Homework Answers
Add Answer to:
What would be the number-average molecular weight of
polystyrene obtained at the
completion of an anionic...
Polystyrene can be polymerized from the starting monomer (styrene) pictured below. a. Anionic polymerization is one...
Polystyrene can be polymerized from the starting monomer
(styrene) pictured below.
a. Anionic polymerization is one method of polymerization that
can be used to generate polystyrene from styrene. Explain what type
of initiator should be used for this reaction
and draw an example of a styrene monomer that has reacted with
initiator.
b. Using this anionic polymerization method and a starting
concentration of 1M styrene and 1mM initiator, what degree of
polymerization (Xn) would you expect if you use up...
a) compute the repeat unit molecular weight of polystyrene b) compute the number-average molecular weight for...
a) compute the repeat unit molecular weight of
polystyrene
b) compute the number-average molecular weight for
polystyrene for which the degree of polymerization is 26,000.
54 (a) Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26,000.
Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a...
Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. Please write legibly Please handwrite.
1. A sample of polystyrene has a number average molecular weight of 30,000 daltons. What is...
1. A sample of polystyrene has a number average molecular weight of 30,000 daltons. What is the number average degree of polymerization (n)? The mer structure is shown below, amu are C-12, H-1; 1 dalton 6.023x103 grams
Molecular weight data for some polymer are tabulated. Determine: a) The number-average molecular weight b) The...
Molecular weight data for some polymer are tabulated.
Determine:
a) The number-average molecular weight
b) The weight-average molecular weight
c) What is the number-average degree of polymerization for this
polymer?
d) What is the weight-average degree of polymerization for this
polymer?
Side note: Please
consider the monomer C3H6
Molecular weight data for some polymer are tabulated. Determine: The number-average molecular weight The weight-average molecular weight What is the number-average degree of polymerization for this polymer? What is the weight-average degree...
4 (20 Points) Calculate the number-average molecular weight and the weight average molecular weight of a...
4 (20 Points) Calculate the number-average molecular weight and the weight average molecular weight of a polymer sample made of polystyrene with a repeat unit of (CH2- CH(CHs)) and composed of two types of chains. 60 percent of the chains have a degree of polymerization of 7,000 and the rest 50,000. Carbon has an atomic weight of 12 g/mol and hydrogen is 1 g/mol.
acylating agent and activated monomer in the anionic ring- 2. What are the roles of an...
acylating agent and activated monomer in the anionic ring- 2. What are the roles of an haln opening polymerization of lactam? (10 points) 3. For the sequential anionic block copolymerizations of styrene and a -methyl styrene under the conditions given below, provide the: (a) Electron arrow-pushing mechanisms; [5 points (b) Intermediates; [5 points (c) Final products; [5 points -80 °C 30 min 80PC 30 min CH OH (d) Imagine that the temperature for the polymerization was misread as 80 °C....
An alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a...
An alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a number-average degree of polymerization of 3406. One of the alternating mers is polystyrene which has a molecular weight of 105_g/mol. Given that the molecular weight of polypropylene is 42 g/mol and that of polyvinyl chloride is 61.5 g/mol, Which of them is the other alternating mer?
It is desired to prepare polyester with the number average molecular weight, Mn 5000 g/mol by...
It is desired to prepare polyester with the number average molecular weight, Mn 5000 g/mol by reacting of 1 mol butane-1,4 diol (HO-CH-CH2-CH2-CH2-OH) with 1 mol of adipic acid (HOOC-CH2-CH2-CH2-CH2-COOH) (a) Write chemical equation illustrating synthesis of the polyester. (b) Calculate the value of the monomer conversion at which the reaction should be stopped to obtain this polymer, assuming perfect stoichiometric balance. What would be polydispersity index for the polymer obtained? (c) Assuming that 0.5 mol % of the diol...
1-Calculate the molecular weight of the repeat unit (monomer) for polystyrene (above) (2 marks) 2-Using the...
1-Calculate the molecular weight of the repeat unit (monomer)
for polystyrene (above) (2 marks)
2-Using the table below, calculate the degree of polymerisation
for polystyrene
Molecular weight range (g/mol)
Number fraction,xi
500-1000
0.02
1000-3000
0.13
3000-5000
0.25
5000-10000
0.41
10000-25000
0.15
25000-50000
0.04
3-Which crystal type would be expected for Nickel Oxide (NiO,
Ni2+ ionic radius = 0.069nm, O2- ionic radius
= 0.14nm) (2 marks)
4-In order to save weight, a composite component is to be made
of aligned fibreglass...
Polystyrene can be polymerized from the starting monomer
(styrene) pictured below.
a. Anionic polymerization is one method of polymerization that
can be used to generate polystyrene from styrene. Explain what type
of initiator should be used for this reaction
and draw an example of a styrene monomer that has reacted with
initiator.
b. Using this anionic polymerization method and a starting
concentration of 1M styrene and 1mM initiator, what degree of
polymerization (Xn) would you expect if you use up...
a) compute the repeat unit molecular weight of
polystyrene
b) compute the number-average molecular weight for
polystyrene for which the degree of polymerization is 26,000.
54 (a) Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26,000.
Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. Please write legibly Please handwrite.
1. A sample of polystyrene has a number average molecular weight of 30,000 daltons. What is the number average degree of polymerization (n)? The mer structure is shown below, amu are C-12, H-1; 1 dalton 6.023x103 grams
Molecular weight data for some polymer are tabulated.
Determine:
a) The number-average molecular weight
b) The weight-average molecular weight
c) What is the number-average degree of polymerization for this
polymer?
d) What is the weight-average degree of polymerization for this
polymer?
Side note: Please
consider the monomer C3H6
Molecular weight data for some polymer are tabulated. Determine: The number-average molecular weight The weight-average molecular weight What is the number-average degree of polymerization for this polymer? What is the weight-average degree...
4 (20 Points) Calculate the number-average molecular weight and the weight average molecular weight of a polymer sample made of polystyrene with a repeat unit of (CH2- CH(CHs)) and composed of two types of chains. 60 percent of the chains have a degree of polymerization of 7,000 and the rest 50,000. Carbon has an atomic weight of 12 g/mol and hydrogen is 1 g/mol.
acylating agent and activated monomer in the anionic ring- 2. What are the roles of an haln opening polymerization of lactam? (10 points) 3. For the sequential anionic block copolymerizations of styrene and a -methyl styrene under the conditions given below, provide the: (a) Electron arrow-pushing mechanisms; [5 points (b) Intermediates; [5 points (c) Final products; [5 points -80 °C 30 min 80PC 30 min CH OH (d) Imagine that the temperature for the polymerization was misread as 80 °C....
An alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a number-average degree of polymerization of 3406. One of the alternating mers is polystyrene which has a molecular weight of 105_g/mol. Given that the molecular weight of polypropylene is 42 g/mol and that of polyvinyl chloride is 61.5 g/mol, Which of them is the other alternating mer?
It is desired to prepare polyester with the number average molecular weight, Mn 5000 g/mol by reacting of 1 mol butane-1,4 diol (HO-CH-CH2-CH2-CH2-OH) with 1 mol of adipic acid (HOOC-CH2-CH2-CH2-CH2-COOH) (a) Write chemical equation illustrating synthesis of the polyester. (b) Calculate the value of the monomer conversion at which the reaction should be stopped to obtain this polymer, assuming perfect stoichiometric balance. What would be polydispersity index for the polymer obtained? (c) Assuming that 0.5 mol % of the diol...
1-Calculate the molecular weight of the repeat unit (monomer)
for polystyrene (above) (2 marks)
2-Using the table below, calculate the degree of polymerisation
for polystyrene
Molecular weight range (g/mol)
Number fraction,xi
500-1000
0.02
1000-3000
0.13
3000-5000
0.25
5000-10000
0.41
10000-25000
0.15
25000-50000
0.04
3-Which crystal type would be expected for Nickel Oxide (NiO,
Ni2+ ionic radius = 0.069nm, O2- ionic radius
= 0.14nm) (2 marks)
4-In order to save weight, a composite component is to be made
of aligned fibreglass...
Most questions answered within 3 hours.
-
PROBLEM 3–25 Changes in Fixed and Variable Expenses; Break-Even
and Target Profit Analysis [LO3–4, LO3–5, LO3–6]...
asked 2 minutes ago -
1. What triggers the opening of each of the different channels:
ligand-gated K+ channels, ligand-gated Na+...
asked 8 minutes ago -
Which of the following is most commonly used to monitor
short-run changes in economic activity?
the...
asked 10 minutes ago -
Two positive charges q are located along the
y axis at y = +a
and y...
asked 12 minutes ago -
State the physical term for an
metallic object which has experienced a 500 00 Volt lightning...
asked 14 minutes ago -
n-butane is added to gasoline to help control its vapor pressure
so that the gasoline performs...
asked 22 minutes ago -
In a certain board game, a player rolls two fair six-sided dice
until the player rolls...
asked 22 minutes ago -
What is the t-critical value for an alpha level of 0.01 for a
one-tailed test for...
asked 24 minutes ago -
How long will it take a 630 W motor to lift a 320 kg piano to...
asked 29 minutes ago -
"Follow-the-sun" development and technical support best
exemplifies _________ as a global flattener.
asked 24 minutes ago -
Frictional Unemployment
a. can be created both by workers quitting to find more suitable
jobs and...
asked 27 minutes ago -
Does Ford building cars in China help, harm, or have no effect
on U.S. auto industry...
asked 28 minutes ago