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Radioactive gold-198 is used in the diagnosis of liver problems. The half-life of this isotope is 2.7 days. If you begin with a 5.6 sample of the isotope, how much of this sample remains after 3.0 days?
Compare the amount of energy released by the complete combustion of 1 gallon of ethanol with the amount of energy released by the complete combustion of 1 gallon of octane.
2 NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) Heating a 1.7184-g sample of impure NaHCO3 gives 0.196 g of CO2. What was the mass percent of NaHCO3 in the original 1.7184-g sample?
If this energy were used to vaporize water at 100 degrees C, how much water in liters could be vaporized? (Assume that the density of water is 1.0 g/mL.)
A solution is prepared by dissolving 19.1 g ammonium sulfate in sufficient water to make100.0 mL of stock solution. A 15.00 mL sample of this stock solution is added to 55.00mL of water. Compute the concentration of ammonium ions and sulfate ions ..
Explain for which of the following species is resonance an important property: HONO, HONO2, N3-, NO2-, NO2
Describe the bonding in NCl- using a molecular orbital description. Assume the molecular orbital levels are ordered as in N2. What is the NCl- bond order? How any unpaired electrons are present?
What is the wavelength (in nm) of photons which have energies of 895 kilojoules per mole
Molten carbonate fuel cells fueled with H2 convert as much as 60% of the free energy relased by the formation of water from H2 and O2 into eletrical energy
Calculate the energy (J) of the photon emitted when an electron in the hydrogen atom falls from n=6 to n=1. Use 2.178 x 10-18 J for the constant in the Bohr equation.
(a) Estimate the time required to reach stationary phase. (b) What will be the final cell density if the fermentation is stopped after only 70% of the substrate is consumed?
what would the coefficent of Al(NO3)3 be in the balanced equation?
Give the detailed reaction mechanism leading to the final product (major). Define what simple chemical test(s) would help establish that you had in fact made the desired alkenes product
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