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In the titration of a solution of a weak monoprotic acid with a .1325M solution of of NaOH, the pH was halfway to the equivalence point was 4.42. In the titration of a second solution of the same acid, exactly twice as much of a 0.1325 M solution of NaOH was needed to reach the equivalence point. What was the pH half way to the equivalence point in this titration?
A zero-order reaction has a constant rate of 2.90×10-4 M/rm s. If after 65.0 seconds the concentration has dropped to 9.00×10-2 M, what was the initial concentration.
For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction C2H6 (g)+ H2 (g) -> 2CH4
A sample of lead releases 221 kJ of heat when freezing. What is the mass of the sample? DHfus = 23 J/g
What mass of iron is needed in order to supply the energy needed to warm 15.0mL of water (d= 1.00 g/cm3) from 23C to 37C
sodium hydroxide do you need to add to the volumetric flask before you dilute the solution to volume with distilled water?
A sample of calcium carbonate absorbs 45.5 J of heat upon which the temperature of the sample increases from 21.1 degrees celcius to 28.5 degrees celcius.
Explain the chemical reactions that have possibly taken place in his body after the exercise. Discuss possible treatments for the freshman and how the treatment works chemically.
A gas is collected over water at a certain temperature. The total pressure is 762 torr. The vapor pressure of water at this temperature is 17 torr.
A 275-g sample of nickel at 100.0C is placed in 100.0 mL of water at 22.0C. What is the final temperature of the water.
Determine the mole fraction of sodium chloride(NaCl) in the solution if this solution is formed by mixing 17.0 grams of sodium chloride NaCl in 85.0 grams of Water?
What is the smallest amount of CuO (in moles) that would establish the equilibrium?
Calculate the partial pressure of ammonia at equilibrium when a quantity of ammonium idodide in heated to 400 degree C.
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