The viscosity average molecular weight of a sample of polyvinyl alcohol in water at 25ºC is found to be 88,173 g/mol. Calculate the intrinsic viscosity of the solution.
The viscosity average molecular weight of a sample of polyvinyl alcohol in water at 25ºC is...
What are the possible source of error in this experiment? Experiment-> Molecular Weight of Polyvinyl Alcohol by Viscosity Select all that applies. Temperature fluctuations of the water bath Incomplete cleavage of the polymer The use of a manually activated stopwatch Partially blocked or unclean viscometer Proper filling of volumetric flasks
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?
1) (25 points) The molecular weight of a polymer can be determined from its viscosity by the following relationship where [n] is the intrinsic viscosity of the polymer M, is the viscosity averaged molecular weight, and K and a are constants specific for the polymer. The intrinsic viscosity is determined experimentally be determining the efflux time, or the time it takes for the polymer solution to flow between two etched lines in a capillary viscometer, at several different concentrations of...
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.
Problem: 1.3: Calculate the number average and weight average relative molecular mass for a sample of polystyrene made by blending eight separate fractions, each of which has a very narrow molecular mass distribution, as follows: RMM | Weight/ g 15k 0.10 27k 0.19 39k56k78k 0.25 0.17 0.12 104k120k 0.08 0.06 153k 0.04 | Solution:
Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile-butadiene) copolymer] in which the fraction of butadiene repeat units is 0.32; assume that this concentration corresponds to a degree of polymerization of 2030. Calculate the molecular weight of the acrylonitrile repeat unit in g/mol. Part 2 Calculate the molecular weight of the butadiene repeat unit in g/mol. Part 3 Calculate the average molecular weight of the copolymer repeat unit in g/mol. Click here to access Table 4.5. m =...
Dehydration of Tert-butyl Alcohol tert-butyl alcohol- molecular weight- 74.12 density- 0.775 g/mL sulfuric acid- molecular weight- 98.08 density- 1.840 g/mL actually measured out 15.2mL of tert-butyl alcohol, actually measured out 32.1mL of 9M sulfuric acid after condensing solution was put into 50ml beaker originally weighing 34.99g and with solution weighed at 37.57g I need help finding mols needed for both, mass/volume needed for both, mass/volume USED for both, mols USED for both, percent yeild mass and percent yeild mols...
Isopropyl alcohol is mixed with water to produce a 38.0% (v/v) alcohol solution. How many milliliters of each component are present in 875 mL of this solution? Assume that volumes are additive. alcohol: mL water: ml The mass of solute per 100 mL of solution is abbreviated as (m/v). Mass is not technically the same thing as weight, but the abbreviation (w/v) is also common. How many grams of sucrose are needed to make 695 mL of a 38.0% (w/v)...
Calculate the molecular weight of a small protein if a 7.0-g sample of the protein dissolved in enough water to make 7.00 x 10 2 mL of solution has an osmotic pressure of 3.8 mmHg at 25.0°C.
3. Suppose a student performs this experiment and obtains a molecular weight of 70 g/mol for isopropyl alcohol. Give valid sources of error for what could have caused the molecular weight to be higher than expected