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What is the frequency of a photon having an energy of 8.56 x 10-16 J?
A 5.00 mL sample of barium hydroxide is titrated to the phenolphthalein endpoint using hydrochloric acid. the five mL sample requires 18.02 mL of 0.0873 M HCl solution to reach the endpoint. what is
Acetaldehye has a pure vapor pressure of 1000 torr at 30 degrees C, a mixture of 12 moles of acetic acid and 8 moles of acetaldehye would have what total vapor pressure?
The water-gas shift reaction is crucial to many industrial processes: H2O(g) + CO(g) ? H2(g) + CO2(g)
Would this be a good example for the formation of a fatty acid in an acidic evironment? CH3(CH2)16CO2-Na+ + HCl → CH3(CH2)16CO2H + Na+ + Cl-
Two moles of butane were completely burned in a pure oxygen atmosphere. How many mL of water was generated in this reaction (d of water=1g/mL) (assume that the water has been condensed and is at roo
The photoelectric effect is used today to make light-sensitive detectors; when light hits a sample of metal in a sealed compartment, a current of electrons may flow if the light has the proper wave
A 69.5g sample of the compound X3O4 contains 19.2g of oxygen atoms. What is the molar mass of element x
A 9% aqueous solution of nitromethane can be readily prepared. Which of the following accounts for nitromethanes solubility in water?
Write the relationship between the rates that each of the reactants and products are being lost or formed. If the rate that hydrogen chloride is being lost is 0.10 M/s, what is the rate that molecul
A 1-L container holds 4.0 moles of Fe and 5.0 moles of H2O. It is heated to 1000 K and reaches equilibrium shown below. Some Fe (1.0 mole) is left unreacted. What is Kc for this reaction?
The temperature of the calorimeter increases from 24.56 *C to 32.01 *C. What is the heat of combustion per gram of quinone and per mole of quinone?
The osmotic pressure of 8.05x10 to the negative third M solutions of Cacl2 and urea at 25 degrees celcius are o.487 and 0.197 atm respectively. Calculate the van hoff factor of Cacl2a
Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0013% Pb by mass. How much of the water (in ml) contains 145 mg of Pb?
The best available balances can weigh amounts as small as 10-5 g. If you were to count out carbon atoms at the rate of two per second, how long would it take to count a pile of atoms large enough to
If a car increases its speed from 14.2 mph to 42.6 mph, by what factor does the kinetic energy of the car increase? Enter your answer to three significant figures, Show work.
When 4g of a sample are dissolved in enough benzene to give 2L of solution the osmotic pressure is 3.2 torr at 25 degrees C. What is the molecular weight of the sample?
A solution contains 100.0 g of water and 15.0 g of alcohol. What is the percent alcohol in the solution? My teacher got 13% and im not sure how?
Give an examples of a free-radical polymerization reaction (e.g. polymerization of ethylene into polyethylene). Indicate all steps of the process: chain initiation, chain propagation, chain terminat
A 0.10 M solution of lactic acid, a monoprotic acid of formula HC3H5O3, was found to have a pH of 2.43. What is the value of Ka for the acid and the percent ionization?
When potassium nitrate dissolves in water, the beaker containing the solution gets cooler. Is dissolving this salt an exothermic or an endothermic process?
What factors determine the boiling or melting points of a material?
They started with 5.872g piece of copper wire. After drying the copper metal in the final step, they recovered 5.414 g of metal. calculate their % recovery?
A 12.5 block of niobium metal (specific heat capacity= 0.268 J/g* celsius) is dropped into a thermally insulated container holding 30.0g H2O at 5 degrees celsius. if the final temperature of the blo
Could you provide examples of some commonly used common weak/strong bases and nucleophiles?