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A student dissolves 80 mg of a crude product in 4.5mL the minimum required of methanol at 25 degrees Celsius. She cools the solution in an ice bath as well as obtains crystals. The crystals are recovered by filtration as well as rinsed with 0.5mL of ice cold methanol. After saying the weight of the crystals is 5 mg. Explain why was the recovery so poor? Explain what could she do to improve this process?
if 100.0 grams of copper cu completely reacts with 25.0 grams of oxygen how much copperii oxide cuo will form from
A zero-order reaction has a constant rate of 3.50×10-4 M/rm s. If after 65.0 seconds the concentration has dropped to 1.00×10-2 M, what was the initial concentration?
Choose one of the following atmospheric issues: air pollution, global warming, ozone depletion, and acid deposition. Then, respond to the following,
How do I calculate the concentration (molarity) using the calibration curve of absorbance vs. wavelength
If two molecules are non-superimposable but are mirror images are they enantiomers or the same molecule
Mixing 20.0mL of a 3.00 M sugar solution with 30.0mL of a 5.00 M sugar solution results in a solution with what molar concentration?
Consider the acid-catalyzed cleavage of propylene oxide with 1-propanol. Provide abbreviated structural formulas for the protonated epoxide substrate and of 1-propanol
a mass of 47.5 g of h2os at 273 k is dropped into 225 g of h2ol at 298 k in an insulated container at 1 bar of
the reaction between c2h4 and hbr to form c2h5br is carried out in a continuous reactor. the product stream is analyzed
The balloon ascends to an altitude of 20 , where the pressure is 76.0 and the temperature is 50. . What is the new volume, , of the balloon in liters, assuming it doesn't break or leak
How many milliliters of 0.0050 N KOH are required to neutralize 21mL of 0.0050 N H2SO4 and How many milliliters of 0.0050 N KOH are required to neutralize 21mL of 0.0050 N HCl
A 1.08 g sample of caffeine, C8H10N4O2, burns in a constant-volume calorimeter that has a heat capacity of 7.85 kJ/K. The temperature increases from 298.55 K to 303.37 K. What is the molar heat of combustion of caffeine (in kJ).
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