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Problem- 1. Why does a recrystallization give a more pure solid sample?
2. What is the problem with adding too much solvent to a recrystallization, ie much more than the minimum amount needed to dissolve the solid sample?
3. What is charcoal used during Recrystatllization?
Answer all three questions and provide required steps
Given that aprotic solvents are not practical for unimolecular processes (little if any reaction occurs via a unimolecular pathway) draw the skeletal structure of the major organic substitution product when (2S,6R)-2,6-dibromo-6-methyloctane is tr..
How much heat is absorbed by nickel when 500.0 g nickel is warmed from 22.4 deg C to 58.4 deg C? [The specific heat of nickel is 0.444 J/(g.deg C.)]
If you have 260.0 mL of water at 25. C and add 110.0 mL of water at 95.0 C, what is the final temperature of the mixture. Use 1.00 g/mL as the density of water.
Two 20.0-g ice cubes at -16.0 °C are placed into 275 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts.
A sample of hydrogen gas was collected over water at 36°C and 855 mm Hg. The volume of the container was 6.50 L. Calculate the mass of H2(g) collected. (Vapor pressure of water = 44.6 torr at 36°C)
an empty erlenmeyer flask weighs 212.0 g. when filled with water d 1.00 gcm3 the flask and its contents weigh 470.9
dinitrogen pentoxide undergoes first order decomposition inchloroform solvent to yield nitrogen dioxide and oxygen gas.
In the Haber process, ammonia is synthesized from N2 and H2: N2 (g) + 3 H2 (g) ? 2 NH3 (g) DGº at 298 K for this reaction is -33.3 kJ/mol. The value of DG at 298 K for a reaction mixture that consists of 1.9 atm N2, 1.6 atm H2 and 0.65 atm NH3 is ..
the normal respiratory rate for a human being is 15.0 breaths per minute. the average volume of air for each breath is
What is the relationship between the standard cell potentials, E, for the following two galvanic cell reactions?
Salicyclic acid forms a polymeric byproduct as a result of this reaction. It is a small percentage of the final product mixture, but it can be visualized via TLC (the small spot just above the aspirin). Provide a balanced chemical equation for the..
What volume of carbon dioxide (CO2) will be produced if 2.90 moles of iron (Fe) is produced?
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