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What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m. Assume the van't Hoff factor for NaCl is 1.87.
How could you isolate the R-(+)-alpha-phenylethylamine from the mother liquor that remained after you crystallized and filtered off the S-(-)-alpha-phenylethylamine
The structures of the disulfides (MS2) show an apparently unusual trend, proceeding from left to right across the transition series. On the left side (TiS2, ZrS2, MoS2, etc.)
One mole of an ideal gas undergoes an isothermal reversible expansion, doing 1 kJ of work and doubling the volume. What is its final temperature? How much heat was added to the gas
In an adiabatic compression if one mole of an ideal gas with a Cv=5R/2, the temperature rises from 293 K to 325 K. Calculate the heat, work, change in enthalpy and change in internal energy
600.0 ml of 0.240 m perchloric acid hclo4aq was added to a high quality constant-pressure calorimeter containing 400.0
Calculate the percent yield of salicylic acid (from 1.00 mmol isolated) from 7.00 g of Ben-Gay ointment. Ben-Gay ointment is 16% menthol
A white powdery solid, and asked to evaluate its purity and to determine whether it might be identical to a given sample of an illegal drug, a white crystalline solid. Clearly explain what you would do, and how you would interpret your results.
A 4.22g sample of CuS was added to excess HCl, and the resulting H2S was collected over water. What volume of H2S was collected at 32 degrees celsius
How much energy is released when 32.4 g of water freezes? The heat of fusion for water is 6.02 kJ/mol.
describe the errors made by the following students in making molar solutions.nbspjames needs a 0.600 m solution of kcl.
A gravimetric method for Al was found to give results that are constantly low by 0.70 mg Al. Calculate the parts per thousand error when 750 mg sample containing approximately 12% Al is analyzed by this method.
What is the maximum number of electrons that can be in a second electron shell (principal energy level)?
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