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If the reaction Fe2N (s) + 3/2 H2 (g) -> <- 2Fe(s) + NH3(g) comes to equilibrium at a total pressure of 1 atm, analysis of the gas shows that at 700 K and 800 K pNH3/pH2 = 2.165 and 1.083, res
Assume that we have a 100.g sample of this compound. What are the subscripts in the empirical formula of this compound?
HCL acid solution is standardized using 0.502g of sodium carbonate. Find the molarity of the acid if 30.5mL are required for the titration.
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
How much energy in kilojoules is required to change 47.6 g of ice at 0 degrees celsius to liquid water at the same temperature in kilocalories?
Calculate the mass of propylene glycol (C3H8O2) that must be added to 637 g of water to reduce the vapor pressure by 4.74 torr at 40°C. The vapor pressure of pure water at 40°C = 55.3 torr.
Benzoic acid is a monoprotic weak acid with Ka= 6.30 x 10 to the 5 negative. What is the pH of a solution of benzoic acid that is .559M in benzoic acid and has a2.25 X 10 to the 2 negative added?
What mass of sucrose should be combined with 474 of water to make a solution with an osmotic pressure of 8.55 at 310 ? (Assume the density of the solution to be equal to the density of the solvent.)
A 15.00 mL sample of this stock solution is added to 57.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final solution.
What weight of a can be removed from a soluton that contains 6.00 grams of a in 50.0-mLs of water by a single extraction using 50.0 mLs of ligroin?
A 2.00-g sample of white solid was vaporized in a 345-mL vessel. If the vapor has a pressure of 985 mmHg at 158°C, what is the molecular mass of the solid?
What measuring device would you use to measure the volume under each of the conditions described below? In some cases, there may be more than one answer to the question.
If the specific heat of the mixture is 4.184 J g-1 degree C1, and the small heat capacity of the calorimeter is ignored, what is the heat evolved, per mole of sodium hydroxide?
The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine:
How many times faster will the reaction occur at 43^circ {rm C} than at 0 ^circ {rm C}? How many times faster will the reaction occur at 43^circ {rm C} than at 0 ^circ {rm C}?
The running engine of an automobile produces carbon monoxide (CO), a toxic gas, at the rate of about 188 g CO per hour. A car is left idling in a poorly ventilated garage that is 5.0 m long, 4.0 m w
A solution of 0.90 g of an unknown nonelectrolyte in 300 mL ofwater at 27?C has an osmotic pressure of 38.4 torr. What is the molecular weight of this compound? (Neglect volumechange due to solute, R
L is allowed to come to equilibrium against a constant external pressure of 8.3 atm at constant temperature. Calculate the work observed for the volume change in the piston (in kJ)
At 700.°C, the total pressure of the system is found to be 3.78 atm. If the equilibrium constant KP is 1.52, calculate the equilibrium partial pressures of CO2 and CO.
Liquid heptane, C7H16 , burns in oxygen gas to yield carbon dioxide and water. What mass of carbon dioxide is produced when 15.0 mL of heptane burns completely?
Then 2.00 mL of solution A is diluted with 8.00 mL of petroleum ether, forming solution B. How many grams of oleic acid are 5.00 mL of solution B?
What are the products of cyclohexanol + SOCl2
Butyric acid is responsible for the foul smell of rancid butter. The pKa of butyric acicd is 4.84. a) Calculate the pKb for the butyrate ion.
The EPA limit for lead in the water supply is 15 parts per billion by mass. Calculate the number of lead ions present in 1.00kg of water that is at the EPA limit for lead.
Explain the general idea of the LCAO-MO method. What is the minimal set of functions necessary to describe water in the LCAO-MO method?