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During the recrystallization of benzoic acid, a student starts with 105 mg of black, impure benzoic acid. After the recrystallization, the student weighs the pure benzoic acid to find there are now only 79 mg. What is this student's percent recovery of benzoic acid?
A sample of bananas in water is found to have a [H3O1+] = 2.51 x 10-5M. What is the pH of the solution? Are bananas acidic (A), basic (B), or neutral (N)
Compute the standard molar entropy change for the combustion of methane gas using S values from standard thermodynamic tables. Presume that liquid water is one of the products.
what is the vapor pressure at 40 degrees Celcius of a solution containing 4.60*10^2 g of glycerin, C3H8O3, nonvolatile, nonelectrolyte solute, in 4.5*10^2 g of water? The vapor pressure of water at 40 degrees Celcius is 55.3 mmHg
What fraction of the original reactant concentration will remain after 2.0 hours?
how many atoms are in a body centered cubic unit cell of an atomic crystal in which all atoms are at lattice
The extract was filtered and placed in a 50.00ml volumetric flask which was filled to the mark. 5.00ml of the solution was transferred to a second 50.00ml volumetric flask. The diluted solution from the second volumetric flask was found to contain..
the signs of the unsquared wave functions are usually shown in plots of the squared functions. why is this so
question a 230.0 g piece of lead is heated to 80.0 deg c and then dropped into a calorimeter containing 633.0 g of
The standard enthalpy of formation of n-octane is -249.95 kJ/mol. Compute the amount of heat liberated when 3.58 g of n-octane is burned completely with excess oxygen to form carbon dioxide and liquid water.
the concentration of nitrogen in water at 25degc was determined to be 7.2 times 10-6 m. calculate the partial pressure
The very dense metal iridium has a face-centered cubic unit cell and a density of 22.56 g/cm3. Use this information to calculate the radius of an atom of the element.
0.4768 g of oxalic acid dihydrate (H2C2O4 • 2H2O) was weighed out and titrated with sodium hydroxide (NaOH) according to the procedure in the handout. Vi was recorded from the buret as 5.91 mL. Vf was recorded from the buret as 42.28 mL. Calculate..
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