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1. A sample of polystyrene has a number average molecular weight of 30,000 daltons. What is...
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.
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.
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?
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.
polymer question A polystyrene sample is made by mixing two types of polystyrene chains. The weight
polymer question A polystyrene sample is made by mixing two types of polystyrene chains. The weight fractions of each type are the same. The degree of polymerization of the first chain type is 96, for the second is 192. What is the number average molecular weight of this mixture?
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...
calculate the number average molecular weight of a copolymer erm Remmaining Time 13:27:41 Calculate the number-average...
calculate the number average molecular weight of a
copolymer
erm Remmaining Time 13:27:41 Calculate the number-average molecular weight of a copolymer of butadiene and dimethylsilaxane in which 1/5 of the repeat units are butadiene, and the rest are dimethylsilacane. Assume the number-average degree of polymerization is 101.500. 8.01E6 amu 9.53E6 amu 7.12E6 amu O 6.66E6 amu Cuit & Save Back Question Menu SUbmit Assgnment
8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a weight-average...
8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a weight-average degree of polymerization of 5500. Calculate the fraction of styrene (C:Hg) and butadiene (C4H6) mers in this copolymer. Atomic weights: C-12, H-1 b) What weight % sulphur must be added to vulcanize polyisoprene (mer weight = 68) by crosslinking one half the possible sites. In this elastomer, each pair of mers has two possible crosslink sites. Assume three sulphur atoms are involved in each...
(a) Any polymeric material will have a distribution of molecular weights, and therefore an average molecular...
(a) Any polymeric material will have a distribution of molecular weights, and therefore an average molecular weight is used to characters the material. Is it possible to have a polyethylene homopolymer with the following molecular weight distribution data and a weight average degree of polymerization of 2090? Why or why not? The polyethylene mer is shown below. (b) Based on the mer structure shown for poly(methyl methacrylate) (PMMA) and polyethylene (PE). Which has potential for greater crystallinity? Provide a brief...
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.
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.
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?
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...
calculate the number average molecular weight of a
copolymer
erm Remmaining Time 13:27:41 Calculate the number-average molecular weight of a copolymer of butadiene and dimethylsilaxane in which 1/5 of the repeat units are butadiene, and the rest are dimethylsilacane. Assume the number-average degree of polymerization is 101.500. 8.01E6 amu 9.53E6 amu 7.12E6 amu O 6.66E6 amu Cuit & Save Back Question Menu SUbmit Assgnment
8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a weight-average degree of polymerization of 5500. Calculate the fraction of styrene (C:Hg) and butadiene (C4H6) mers in this copolymer. Atomic weights: C-12, H-1 b) What weight % sulphur must be added to vulcanize polyisoprene (mer weight = 68) by crosslinking one half the possible sites. In this elastomer, each pair of mers has two possible crosslink sites. Assume three sulphur atoms are involved in each...
(a) Any polymeric material will have a distribution of molecular weights, and therefore an average molecular weight is used to characters the material. Is it possible to have a polyethylene homopolymer with the following molecular weight distribution data and a weight average degree of polymerization of 2090? Why or why not? The polyethylene mer is shown below. (b) Based on the mer structure shown for poly(methyl methacrylate) (PMMA) and polyethylene (PE). Which has potential for greater crystallinity? Provide a brief...
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