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The first step in the preparation of lead from its ore (galena, PbS) consists of roasting the ore.Determine the standard enthalpy change for this reaction using enthalpies of formation.
The specific heat of copper metal was measured by putting a piece of the metal weighing 35.4 g in the hot water. The quantity of heat absorbed by the metal was measured to be 47.0 J from the tempera
When 21.45 g of potassium nitrate, KNO3, was dissolved in the water in a calorimeter, the temperature fell from the 25.00*C to14.14*C. What is the ΔH for the solution process?
The oxidation of 0.4362 g of naphthalene (C10H8) caused a temperature rise of 1.707 K in an adiabatic bomb calorimeter. The heat capacity of the calorimeter, the final temperature was 298 K, water
Determine the numbers of grams of methanol (CH3OH, FM 32.04) are contained in the 0.100 L of 1.71 M aqueous methanol (that is, 1.71 molCH3OH/L solution)?
Calculate the wavelength of light that is absorbed by the He+ ions, when an electron is excited from the Bohrorbit with n = 3 to the n = 4 state?
For the titration of ethanoic acid with sodium hydroxide discuss why the various equations are used for determining the pH at various stages in the titration, making clear why each equation only app
Why does CH2Cl2(dichloromethane)solvent(lower layer) have higher density than water while nonchlorinated solvents like hexanes and ether(top layer) have lowerdensity than water, i.e what exactly is
Determine how much caffeine should be obtained when the 20 mL for the water layer with 25 mg of caffeine in it before extraction and the 2 x 6 mL for the CH2Cl2 layers
Determine the molarity of the solution if 56.8 mL of BaCl2 solution is needed to precipitate all the sulfate ion in a544 mg sample of Na2SO4 (forming the BaSO4),
Determine the atomic packing factor for a body-centered tetragonal crystal with the following dimensions: a=b=2R, c=2R* , where R is the atomic radius.
What mass of CO will be present at equilibrium if 1.50 mol of each chemical species are placed in a 3.00 L flask and allowed to achieve the equilibrium above.
A fuel oil is burned with the air in a boiler furnace. The combustion forms 812 kW of thermal energy, of which 65% is transferred as heat to boiler tubes that pass through the furnace.
What volume of an organic solvent must be used to effect 90% separation in one extraction when only 2.7 g of a certain compound dissolves in the 100 mo of water? (k=15). Second, explain what percen
What is the concentration of the sulfuric acid solution when the 15.50 mL o f a 0.1075 M NaOH solution is needed to neutralize the15.00 mL of a sulfuric acid solution?
Calculate the percent of linear change during the sc-to-bcc transition if a certain metal undergoes a sc-to-bcc change (sc=simple cubic) upon heating to 500 degrees Celsius.
Determine the distance, in nm, among the point (.5,1,.75) and the point (.25,.5,0) in a cubic crystal with a unit cell dimension of 0.150 nm.
When the barometric pressure was 80 mm Hg a sample of O2 was collected over water at 39.4 Celsius. The volume of the gas collected over the water was 2.94 L.
Draw the wave function for the 2s electron of the H atom. Demonstrate the setup for the determination of the average distance of the 2selectron from the nucleus and solve for the average di
Discuss why you selected pharmacy as a career and how the Doctor of Pharmacy degree relates to your immediate and long-term professional goals. Explain how you're educational, personal, and profess
After passing 50.00 ml aliquot of the diluted unknown sodium chloride solution through a cation exchange resin, 30.00 ml of 0.01000M sodium hydroxide solution was required to titrate the eluate.
The absorbance values of solutions of known NaC7H5O3 concentration were calculated. The plot of concentration vs absorbance was linear with a slope of 1681 L/mol.
Calculate the standard enthalpy of formation (ΔHf) of NaF (s) when .560g of Na (s) reacts with excessF2 (g) to produce the NaF (s), 13.8 kj of heat is evolved at standard state conditions.
Explain how much heat is liberated when 7.15 g CaO(s) is dropped into a beaker which is having 152 g H2O?
Explain what weight of water would be necessary to carry over 1g of toluene if a mixture of toluene and water is distilled at 97 C.