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The first order decay of a radionuclide was observed. The initial activity was 0.00658 disintegrations per second per gram and after 317 seconds, the activity was 0.00213 disintegrations per second per gram. What is the half-life, in seconds, of the radionuclide?
Sodium borohydride reacts very slowly with ethanol to evolve a gas. Write a balanced equation for this reaction.
When sodium is heated, a yellow spectral line whose energy is 3.37x10^19 J/photon is produced. What is the frequency and wavelength of this light?
A sample of Br2(g) takes 50.0 min to effuse through a membrane. How long would it take the same number of moles of Ar(g) to effuse through the same membrane
Although aluminium chloride is ionic in the solid state it is molecular in the gaseous state. write the lewis structure, prepare a VSEPR sketch, describe the geometry, prepare a VB sketch, and desribe the bonding in gaseous AlCl3
solid sodium sulfate reacts with solid carbon to form solid sodium sulfide and carbon monoxide. if 15 grams of sodium
A student wishes to establish experimentally the number of fungal particles in a fixed volume of air. He uses a liquid medium suitable for the growth of most fungi and exposes the liquid to air in a rectangular container of dimensions 15 cm × 15 c..
if a sample of 3.16g at a pressure of 0.750 atm and temperature of 45 degree celsius then calculate what is the molar
A container holds equal masses of methane gas (molar mass 16.05 g/mol) and oxygen gas (O2, 32.00 grams/mol) The partial pressure of CH4 is how many times the partial pressure of O2?
Predict the aqueous phase equilibrium concentration of phenanthrene at 25*C if the values for this compound are Cs = 1.1 mg/L, P^v = 1.6 x 10^-7 atm, KH = 4.0 x 10^-5 atm*m^3/mol, and logKow = 4.52.
calculate the partial pressure in atmospheres of each gas assuming that the total pressure of the gases is 1.34atmrm
Calculate the solubility of copper (II) iodate in 0.56 M copper (II) nitrate. Ksp* is 7.4x10-8 M3.
A serum sample of a concentration of 23.0 ppm. How many mL of 0.010M EDTA solution would be added to 100 mL of serum sample to get to a final
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