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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?
An insecticide has the weight percents C=55.6%, H=4.38%, Cl=30.8% and O=9.26%. the approximate molar mass is 345 g/mol. what is the molecular formula?
At 500°C and 93.2 kPa, the mass density of sulfur vapour is 3.710 kg m-3. What is the molecular formula of sulfur under these conditions.
How many grams of Acetylene are produced by adding water to 5 g CaC2?
A compound that has a molecular ion peak in its mass spectrum at mass 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm-1. Can we say the compound has a molecular mass of 94?
A sample of iron absorbs 67.5 J of heat, upon which the temperature increases from 21.5 C to 28.5 C. If the specific heat of iron is .450 J/g-K, what is the mass (in grams) of the sample?
Why does the temperature continually decrease as a solution containing solute freezes instead of maintaining a constant temperature as a pure liquid would do?
In an effusion experiment, it was determined that nitrogen gas, N2, effused at a rate 1.812 times faster than an unknown gas. What is the molar mass of the unknown gas?
Calculate the heat released when 211 g of water at 23.0 oC is converted to ice at -10.0 oC. The specific heat of liquid water is 4.184 J/g . oC, the specific heat of ice is 2.09 J/g . oC, Δ