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You have a solid A with an impurity B and you would like to purify A. Your initial? mixture is 80% A and 20% B (where A and B have the same molecular weight). As often occurs in organic chemistry, both the impurity and the desired component in a solid mixture may have similar solubilities. You use methanol as the solvent to recrystallize 10 g of the initial mixture and obtain 8 g of recrystallized product.
Assuming A and B have identical solubilities in methanol at all temperatures: What is the % composition of the recrystallized product?
The enthalpy change for the reaction of 50.0ml of ethylene with 50.0ml of H2 at 1.5atm pressure (problem ^H= 0.31kj. What is the value of ^E
The Ogallala aquifer is the largest in the United States, covering 450,000 across eight states, from South Dakota to Texas. This aquifer provides 82% of the drinking water for the people who live in this region
From each pair of compounds, circle the one with the indicated characteristic. Explain your choice. more basic: 4-nitroaniline or 4-methoxyaniline
Calculate K for 2 NO(g) + O2(g) 2 NO2(g) from the observation that when equilibrium is established at 500 K, there are 0.190 moles NO2, 2.65 X 10-4 moles NO, and 0.606 moles O2 in a volume of 0.759 liters.
soluble plant fertilizer is 0.070% by weight. if a 19.0g sample of this fertilizer is dissolved in 2.0L of solution, what is the molar consentration
How much PV work is done in kilojoules and what is the value of ^E in kilojoules for the reaction of 6.50g of acetylene at atmospheric pressure if the volume change is -2.80L
A 98 L sample of dry air cools from 138°C to -30.°C while the pressure is maintained at 2.85 atm. What is the final volume?
What is the final pressure in the container if 705 mL of helium gas at 205 mm Hg is compressed to 255 mL?
Calculate the pH of the resultant solution of mixing together two solutions of 2 L of 1.0 M acetic acid
An unknown organic compound with formula C5H10O2 contains two chirality centers. The unknown compound gave both a positive Tollen's test and iodoform test. What is the structure of the unknown compound
Calculate the percent yield of the t-butyl methyl ether. MW: 93 g/mol 32 g/mol 88 g/mol Denisty: 0.85 g/mL 0.79 g/mL A mixture of 3.0 g of 1,1-diphenylethylene and 100 mg of sulfuric acid was heated for 2 hours.
Instructions for antacid tablets may direct the user to take 2-3 tablets for reduction of stomach acid. Assuming that a particular individual's stomach contains 1 quart of 0.1 M HCl, and that an antacid tablet contains as its active ingredient 500..
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