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Cheap ethanol, C2H5OH, manufactured from crude oil, can be used in fake wine instead of of ethanol derived from fermentation of grapes. this fake wine, however, shows very little radioactivity compared to genuine wine. explain why?
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Compute the pH of the solution before the addition of any HNO3. Kb of NH3 =1.8 × 10-5.
A radioactive sample contains 1.30g of an isotope with a half-life of 3.5 days. What mass of the isotope will remain after 5.6 days? (Assume no excretion of the nuclide from the body.)
if an athlete expends 1850KJ/h (kilojoules per hour), how long does he have to exercise to work off 1.0lb of body fat?
B: A 75.0 mL colume of 0.200 M NH3 (Kb=1.8x10^-5) is titrated with 0.500 M HNO3. Calculate the pH after the addition of 27.0mL of HNO3.
Calculate the moles of N2 that will be in 224 L at STP and the partial pressure of O2 in Pa for air at 2.50 atm pressure
The pyrene excimer emission spectrum at a (higher/lower/same) wavelength than (as) the excited pyrene fluorescence emission spectrum. Explain.
Enough Al2(SO4)3 solid is added to water to prepare 100.0 mL of a 0.150 M solution of aluminum sulfate. What is the concentration of sulfate ion in solution?
Crystalline potassium bromide has a rock salt structure and a density of 2.75 g/cm^3. Calculate its unit-cell edge length.
if oxygen gas were collected over water at 22 c and the total pressure of the wet gas were 650 mm hg what would be the
the partial pressure of oxygen in the atomsphere is 0.20 atm, what is the solubility of dissovled oxygen in blood? recall that the soulibilty of oxygen constant
determine how many kgs of ca are there in a 205-pound man if 1.4 percent of the mass of a human body is calciumca?an
At 25 degrees Celsius the rate constant for the first-order decomposition of a pesticide solution is 6.40 x 10^-3 min^-1 If the starting concentrate of pesticide is 0.0314M what concentration will remain after one hour at 25degreesC
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