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Three mixtures were prepared from three monodispersed polystyrene samples (with molar masses of 10,000, 30,000, and 100,000 g/mol) as indicated below:
(a) equal numbers of molecules of each sample,(b) equal masses of each sample, and(c) by mixing in the mass ratio 0.145: 0.855 the two samples with molar masses of 10,000 and 100,000 g/mol.
For each mixture calculate the number-average, weight-average molar mass and polydispersity.
A 25.0 mL sample of 0.150 M chloroacetic acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point. The of chloroacetic acid is 1.4 × 10-3.
assume you completely hydrolyze a sample of the peptide phe-val-lys-ser using the appropriate protease in a phosphate
Calculate the applied pressure necessary to inflate the alveoli with the surfactant, in units of Torr. By what factor has the addition of the surfactant changed the inhalation pressure
Identities of the components in a mixture may be determined by a technique called spiking. Suppose you had run a gas chromatogram on your product and had then deliberately added a drop of a known sample of 3-methylcyclohexene to a drop of your pro..
when silver ions are added to the red fescn2 ions the red solution disappeared and a white precipitate of agscn formed.
The final temperature was 52.0 C. Assume that the solution has a specific heat capacity of 4.184 J/(g K) and a density of 1.00 g/ml. Calculate dH for the following reaction in kJ.
Write a reaction mechanism for the reaction of 1-chloropentane with NaHS using dimethylformamide as the solvent. Draw the structure of the reaction intermediate clearly showing its geometry.
A 38.8 L volume of methane gas is heated from 25°C to 72°C at constant pressure. What is the final volume of the gas
Calculate the final volume of a 0.500 L gas container that increased in temperature from twenty six degree Celsius to sixty degree celsius while the pressure increased from 760 torr to 1170 torr?
how does nitrobenzoic acid form as a by-product during the nitration of methyl benzoate and how is it removed?
what volume and mass of steam at 100 degrees c and 1.00 atm would during condensation release the same amount of heat
How many moles of a reducing agent are used in a reaction containing 1.5L of this material which possesses a density of 0.8 and a molecular weight of 56
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