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Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows:
C5H5N + H2O <-----> C5H5NH+ + OH-
The pKb of pyridine is 8.75. What is the pH of a 0.155 M solution of pyridine?
Calculate the thermal energy (in J) needed to increase the temperature of a 2.4 kg piece of iron from 29.9o C to 51.2o C. The specific heat of iron is 0.449 J/g*Co. Type your answer in scientific notation using the format 8.050e-3 for 8.050 × 10-3.
The heat of fusion of water is 6.01 kJ/mol and the molar heat capacity is 36.6 J/(oK.mol) for ice and 75.3 J/(oK.mol) for liquid water.
A sample of gas has a mass of 5.00 mg and occupies a volume of 4.13 mL at 23ºC and 745 torr. What is the molecular weight of the gas?
Nitrogen and hydrogen combine at high temperature, in the prescence of a catalyst, to produce ammonia N2(g)+3H2(g)>>>>>>2NH3(g)
A 70.0 g piece of metal at 22.0°C is placed in 100.0 g of water at 80.0°C in a coffee cup calorimeter (with negligible heat capacity), and the metal and water come to the same temperature at 75.6°C. What is the specific heat capacity of the metal
Calculate Kp at this temperature. b. Would an increase or decrease in temperature lead to the production of more ammonia c. List two other things you could alter experimentally to increase the amount of ammonia (note: don't use the same effect and..
when 500 L of a 2.0 M solution of Pb(NO3)2 is mixed with an excess of 1.00 M solution of KI, how many grams of lead(II) iodine are formed?
the freezing point of a solution containing 4.12 g of unknown solute in 100 g of camphor is 166.2 c. camphor has kf
The mass of the KHP is 1.496 g. Before the titration the buret reading was 0.7600 mL and afterwards it was 28.13 mL. A 146.30 mL sample of a solution of sulfuric acid, H2SO4, is neutralized by 115.36 mL of the NaOH solution from the problem above...
You are asked to prepare a standard solution of 10.0 mM of serine at pH 6.34 for a biochemistry experiment. The pI of serine is 5.68. What percentage of the serine in the solution is present as the anion
In an experiment, at this temperature, 1.10 mol of H2 and 1.10 mol of F2 are introduced into a 1.08-L flask and allowed to react. At equilibrium, all species remain in the gas phase.
hydrogen has a henerys law constant of 1.07x10^-6 M/mmHg at 25 degrees celsius when dissolving in water. if total pressu of gas (H2 plus water vapor) over water is 1 atm. what is the concentration of gas phase hydrogen
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