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1.The solubility of benzoic acid in water is 6.80 g per 100 mL at 100 °C and 0.34 g per 100 mL at 25 °C. a) Calculate the minimum volume of water needed to dissolve 1.00 g of benzoic acid at 100 °C. b) Calculate the maximum theoretical percent recovery from the recrystallization of 1.00 g of benzoic acid from 15 mL of water, assuming the solution is filtered at 25 °C. 2. The solubility of acetanilide in your recrystallizing solvent is 5.0 mg per mL at 10 °C.
a)Calculate the maximum percent recovery in this experiment, assuming a 15.0-mL recrystallizing solution is filtered at 10 °C. b) Calculate the percentage recovery of acetanilide produced in your experiment. c)How do your results compare to the maximum percent recovery? Briefly explain. 3. A student rushed through this experiment. Describe the effect that the following procedural changes would have on the percent recovery of acetanilide. Briefly explain the basis of each answer. a) Rather than adding 0.5-mL portions of boiling solvent to the acetanilide, the student added 5-mL portions of boiling solvent. b) The student did not pre-heat the gravity filtration apparatus in Part 3. c) The student forgot to cool 5 mL of solvent in Part 5 and washed the crystals with room temperature solvent.
Explain which atom in each of the following pairs has the greater electronegativity. Use merely a periodic table. a) O, S b) K, Ge c) Br, Te
calculate the osmotic pressure in mm hg of 6.00 l of an aqueous 0.889 m solution at 30.degc if the solute concerned is
A 22.0 L volume of an ideal gas in a cylinder with a piston is at a pressure of 3.0 atm. Enough weight is suddenly removed from the piston to lower the external pressure to 1.5 atm. The gas then expands at constant temperature until its pressure i..
Exactly 100 mL of 0.15 M nitrous acid (HNO2) are titrated with a 0.15 M NaOH solution. Calculate the pH for the following.
The total pressure of a mixture of N2O4 and NO2 is 1.5 atm. If Kp=7.1 (at 25 degrees C) calculate the partial pressure of each gas in the mixture.
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal places.
Bond energy is the change in enthalpy that accompanies the dissociation of one mole of the bond in the gaseous state.
if a 50.0 liter container holds 45 moles of a gas at a temperature of 200 C what is the pressure inside the container
orbits around a definite point in space made of neutrinos and electrons D) is not a definite point in space, but rather it is a cloud of smaller particles called quarks that deflect alpha particles
A certain radiation has a wavelength of 474 nm. What is the energy, in joules, of (a) one photon
Determine the quantity of stock 75% EtOH required to prepare 300ml of a 25% EtOH solution.
Tungsten trioxide (WO3) has a rich yellow color and is often used as a pigment in ceramics and paints. In order to test a ceramic vase for its WO3 content, a 10.00 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO3 to W3 . ..
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