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A.- An old tablet of vitamin C weighed 1.022g. It was dissolved in 500mL water, and a 25.0mL aliquot of this solution required 22.6mL of .005M I2 solution to oxidize it. Calculate the mg vitamin C in the tablet. B.- The strenght of an I2 solution may be verified by reacting the I2 with thiosulfate (S2O3)2- I^2+2(S2O3)^2- -> 2I^-+(S4O6^)2- 15.0 mL of an iodine solution of unknown molarity was titrated against a 0.001M solution of S2O3^2-. The blue black iodine-starch complex just disappeared when 20.2 mL of thiosulfate was added. What is the exact molarity of the I2 solution?.
By looking at the structure of tetrabutylammonium bromide, explain how this reagent can carry ions from the aqueous phase into the organic phase.
Write the condensed electron configurations for the Pt atom. Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For example, should be entered as [He]2s^22p^2.
What type of crystal (atomic, molecular, ionic, metallic, or network covalent) are crystals of each of the following:
what can you conclude about the process of breaking bonds in the liquid as compared to the gas phase? Explain the difference in the heat of formation values between the two phases.
Nitric acid is usually purchased in a concentrated form that is 70.3% HNO3 by mass and has a density of 1.41 g/mL. How much concentrated solution would you take to prepare
a 51 kg person drinks 490. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 17% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake?
Draw the Newman projection for the most stable conformation of (2R,3S)-2,3-dichloropentane. Please explain how to do this question, thanks in advance.
In a gas mixture, the partial pressures are nitrogen 435 , oxygen 145 , and helium 240 . What is the total pressure ( torr) exerted by the gas mixture?
Why do we use an ethyl acetate/hexane mixture as a solvent in reaction of cyclopentadiene with maleic anhydride, rather than just pure hexane or ethyl acetate?
A vapor composed of 0.75 mole fraction ethanol and 0.25 mole fraction acetic acid at 120.0 mm Hg (absolute), is in equilibrium with a liquid phase also composed of ethanol and acetic acid.
The enthalpy change for converting 10.0 g of ice at -25.0°C to water at 80.0°C is __________ kJ. The specific heats of ice, water, and steam are and respectively. For H2O, Hfus = 6.01 kJ/mol, and
how much energy is required to warm 100g of H2O from 20 degrees celcius to 80 degrees celcius if it is initially in a 140g glass flask? the specific heat of water is 4.18 J/g degree celcius.
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