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When a 7.00g sample of KCN is diisolved in water in a calorimeter that has a total heat capacity of 5.989 KJ K^-1, the temperature decreases by 0.2010 K. Calculate the molar heat of solution of KCN.
What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires
a 150.0 g sample of metal at 80 c is added to 1500.0g of H2O at 20 c. the temperature rises to 23.3 c. assuming that the calorimeter is a perfect insulator, what is the specific heat of the metal.
Cobalt-60 is a beta emitter with a half life of 5.3 years. Approximately what fraction of cobalt-60 atoms will remain in a particular sample after 12.0 years?
Lactic acid has one acidic hydrogen atom in its structure. A 0.10 M solution of lactic acid has a pH of 2.44. Calculate the Ka of lactic acid.
A glycerol solution weighing 153.2 mg was treated with 50.0 mL of 0.0899 M Ce4+ in 4M HClO4 at 60 degrees C for 15 min to convert glycerol into formic acid: C3H8O3 + 8Cefourplus + 3H2O ----> 3HCO2H + 8Cethreeplus + Fethreeplus
Calculate the concentrations of all species in a 1.73 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10-2 and Ka2 = 6.3× 10-8.
How many electrons must aluminum lose before it can reach a stable electronic configuration? Use the table of ionization energy to justify your answer.
A flask contains 0.500 mol of liquid bromine, rm Br_2. Determine the number of bromine molecules present in the flask.
What is the total combined mass of carbon dioxide and water that is produced when an automobile gasoline tank holds 20 of gasoline. When the gasoline burns, 85 of oxygen is consumed and carbon dioxide and water are produced?
The average person generates about 2500 Kcal of heat a day. How many kilowatt-hours of energy is this? If walking briskly dissipates energy at 500 W, what fraction of the day's energy does walking one hour represent.
Calculate the molar concentration of OH - ions in an 1.37 M solution of hypobromite ion, BrO- (Kb = 4.0 10-6).
A biochemical engineer isolates a bacterial gene fragment and dissolves a 19.6 mg sample of the material in enough water to make 37.9 mL of solution. The osmotic pressure of the solution is 0.340 torr at 25°C.
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