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A certain reaction has an equilibrium constant of 300 at 25 degrees celsius and 309 at 35 degrees celsius. What is deltaH^0 per mole for this reaction
In the process of recrystallization, sometimes, it's necessary to scratch the side of the flask with a glass rod. What does this do
Draw the structural formula of an alkane that has eight carbons and only primary hydrogens.
At 25 degrees celcius and 765 Torr, carbon dioxide has a solubility of 0.0342 M in water. What is the solubility at 25 degrees celcius and 2030 Torr. M
What is the hydroxide-ion concentration in a solution formed by combining 200. mL of 0.15 M HCl with 300. mL of 0.091 M NaOH at 25ºC?HCl(aq) + NaOH(aq) ? NaCl(aq) + H2O(l)
What is the equilibrium concentration of chloroacetic acid, HC2H2O2Cl, in a solution prepared by dissolving 0.0277 mol of HC2H2O2Cl in 1.00 L of water
Equal volumes of an unknown gas and nitrogen (N2) gas take 5.37 min and 3.55 minutes, respectvely to effuse through a small pin hole. calculate the molar mass in g/mol of the unknown gas
What is the percent ionization at equilibrium in a 0.60 M solution of dimethylamine, (CH3)2NH (Kb = 5.1 × 10-4), at 25oC
What is the pH of a 0.17 M solution of methylamine (CH3NH2, Kb = 4.4 × 10-4) at 25oC
Using concentrations, the solubility of [Ag+] in a solution of 0.01 M KCl is 1.8 * 10-8. Calculate the percent relative error when using concentrations for the solubility of [Ag+] compared to activi
Given the parent compound, draw the mass spectrum fragment that is observed at m/z 77. Include any hydrogen atoms and the charge.
Manometers can use liquids other than mercury to measure small pressure differences. On a day when the barometric pressure is 764.3 torr, a water manometer, connected between the atmosphere and a gl
Freons are controversial because of the damage they do to the ozone layer in the stratosphere. A 4.33-g sample of a particular freon in a 2.55 L bulb at 25°C has a pressure of 262 torr. What is
In order to neutralize a 2M HCL solution you could use a 2M NaOH solution. What will be the difference(if any) if you would use a 6M NaOH solution instead
Based on a Kc value of 0.170 and the given data table, what are the equilibrium concentrations of XY, X, and Y, respectively
A researcher suspects that the pressure gauge on a 49.9-L gas cylinder containing nitric oxide is broken. An empty gas cylinder weighs 135 lb. The weight of the partially full cylinder is 161.5 lb.
A mixture of fuel containing 0.530 mol CH4/mol, 0.330 mol C3H8/mol, and 0.140 mol C5H12/mol at 60.0°C and 125 kPa (gauge) enters a furnace at a rate of 91.0 L/min where it reacts with 17.4% exce
Distillate (condensate) in four separate containers,~1mL in each, during the fractional distillation of 4mL of a (1:1) cyclohexane-toluene mixture, and then obtain IR spectra for each fraction
Mercury has the density of 13.6 g/cm3. what is the mass of a cylinder of mercury with a tube with an inside diameter of .45 cm and a height of 76.0 cm
(a) What is the rate of the reaction if the concentration of CH3Br is doubled? (b) What is the rate of the reaction if the concentration of NaOH is halved? (c) What is the rate of the reaction if th
At what optimum pH would you recommend to separate cytochrome C; pI 10.6 from a mixture od myoglobin; pI 7.0, ribonuclease; pI 7.8, and leucine; pI 6.0 using a Dowex 50 column? Explain.
a mixture of Phe (pI 5.5), Thr (pI 6.5), Asp (pI 3.0), His (pI 7.6), and Lys (pI 9.8) at pH 9.8 is loaded on an anion-exchange column and then eluted with a pH gradient of lowering pH. what order wi
Calculate the cell potential for the following reaction as written at 61 °C, given that [Mg2 ] = 0.854 M and [Ni2 ] = 0.0100 M. If Mg(s)+Ni^2+ <--> Mg^2+ + Ni(s). E^o for Mg half-cell is -
Suppose that 100.0 mL of a 0.120 M solution of magnesium chloride is mixed with 100.0 mL of .210M sodium hydroxide. Assume that the volumes are additive (which is only approx correct) and calculate
what would happen if the bottle was labeled salicylic acid from benzene actually contained acetylsalicylic acid