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Ascorbic acid (vitamin c) is a diprotic acid of molecular weight 176 g/mol. A sample of vitamin supplement was analyzed by titrating a 0.1g sample dissolved in water with 0.02 M NaOH. A volume of 15.2 ml of the base was required to completely neutralize the ascorbic acid. What was the mass percent of ascorbic acid in the sample?
A 248 mL gas sample has a mass of 0.436 g at a pressure of 753 mm Hg and a temperature of 27 degrees celcius.what is the molar mass of the gas
Calculate the number of Cys residues in the peptide assuming that the total solution volume has not changed after addition of Ellman's reagent and that the stoichiometry of the reaction is 1:1 (i.e. 1 mole of the yellow dye is produced from 1 mole..
A student was using the concentrations of pipet calibration data listed in the Background Information for the determination of ka or propionic acid. Explain the problem the student encountered when preparing the following equilibrium mixture.
determine the molarity of a solution prepared by dissolving 45.0g of CH3OH in sufficient water to make 725mL.
What is the OH- in a solution that has a pH of 4.92? Give your answer to 3 significant figures using E-notation (i.e., 1 number before and 2 after the decimal point)
Although the viscosity varies over a factor of more than two in the series from hexane to nonane, the surface tension at at 25 degrees Celsius increases by only about 20% in the same series. How do you account for this
A collection of electrons is confined to an infinitely deep well or 1-D box having a 4 nm width. What wavelength photon in micrometers and nanometers when absorbed by an electron in a n=3 level will cause the electron to undergo a transition from ..
hexane is a hydrocarbon a molecule containing only carbon and hydrogen with a molecular weight of 86.18 gmol a density
liquid nitrogen has a density of 0.808 gml at -196 c. if 440.0 ml of ln2 is injected into a weather balloon to inflate
The activation energy for the reaction O + O3 ? 2O2 is 25 kJ/mol, and the enthalpy change is ?H = -388 kJ/mol. What is the activation energy for the decomposition of O2 by the reverse reaction
What is the detector in a spectrograph in which spectral lines are recorded photographically
for a maximum power heat engine operating with a cold temperature of 27 celsius what must be the hot temperature for 50
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