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A student adds 4.90mL of a 0.420M HCl solution to the beaker. How much will the pH change? (pKa of acetic acid is 4.760).
If you knew an electron transfer center in a protein had a reduction potential of -400 mV, what would be the most likely type for the electron transfer center? (a) Iron-sulfur center, (b) heme cente
A particular substance absorbs very strongly at 620 nm. Assuming that the path length is 1.00cm, calculate the value of the molar absorbitivity coefficient, E.
After equilibrium is reached, the partial pressure of NO2 is 0.512 atm. (a) What is the equilibrium partial pressure of N2O4? (b) Calculate the value of Kp for the reaction.
When 9 mL of a solution containing 1.53 M Na3PO4 is diluted to 36 mL, a dilute solution is formed. How many moles of Na+ ions are contained in 18 mL of the dilute solution?
Which solution has the highest vapor pressure? lowest melting point depression? greatest osmotic pressure? least ability to conduct electricity?
A deep-sea diver uses a gas cylinder with a volume of 50.0 L and a content of 51.2 g of O2 and 132.6 g of He. Calculate the partial pressure of each gas and the total pressure if the temperature of
In washing machines, 125 mL of bleach is added to 10.0 L of water. Determine the pH of the solution produced inside the washing machine.
Which type of intermolecular attractive force operates between (a). all molecules, (b). polar molecules, (c) the hydrogen atom of a polar bond and a nearby oxygen atom?
A solution is prepared by dissolving an unknown mass of urea, (NH2)2CO, in enough water to make 100.0 mL of solution. The osmotic pressure of the solution at 25.00 °C is 47.9 atm. How many grams
Calculate the volume of dry CO2 produced at body temperature (37 degree Celsius) and 0.950 atm when 25.0 g of glucose is consumed in this reaction.
By how many degrees should we increase the temperature of the flask to increase the mercury vapor pressure by a factor of ten?
A gaseous mixture containing 20 moles of nitrogen, 10 moles of oxygen and 5 moles of methane exerts a total pressure of 10 atm. What is the partial pressure of the nitrogen?
Using structures for all species, write the complete esterification reaction begun below:
The vapor above this solutionis collected and condensed. Using the following data, determine the composition in mole fraction of the condensed vapor.
When X rays of wavelength 0.124 nm are diffracted by a metallic crystal, the angle of first order diffraction (n=1) is measured to be 21.3o.
The vapor pressure of pure CCl4 is 531 torr at 65 degrees Celsius. What is the approximate molar mass of the solute?
50mL of a 0.133 M sodium iodine solution is mixed with 42.6mL of a 0.110M solution of lead nitrate. A yellow precipitate, lead iodine(PbI2), is obtained. Calculate the mass of PbI2 obtained from the
The crystallization front typically travels at a constant speed through the solution until it reaches the boundaries of the system, then stops. What order of rate law is described by this behavior?
In the reaction A+3B--->2C+D, the inital rate of dissearance of A is 2.0 mol/sec. What is the rate of disappearance of B? What is the rate of appearance of C?
A sample of gas in a rigid container at 30 degrees Celsius and 2.00 atm has its temperature increased to 40.00 degrees celsius. What will be the new pressure?
A sample of 0.46g He and an unweighed quantity of O2 are mixed in a flask at room temperature. The partial pressure of He in the flask is 75 mmHg, and the partial pressure of O2 is 145 mmHg. What is
What is the pH of the solution which results from mixing 150 mL of 0.25 M CH3CO2H(aq) and 125 mL of 0.25 M NaOH(aq) at 25 degree Celsius?
What are the errors in the energy transformation using electrically heated calorimeter experiment (energy transfer between electrical and heat energy)?
A reaction has a rate constant of 1.24×10-4 at 26 and 0.225 at 78. Determine the activation barrier for the reaction.