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Rb-87 decays with a half-life of 48.8 billion years to Sr-87. For short periods of time, there are so few decays that the number of changed nuclei is far smaller than the experimental error. The current limit on object ages therefore is 100,000,000 years or older. What is the percentage of Rb-87 left after 100,000,000 years?
The acid-dissociation constant for hypochlorous acid (HClO) is 3.0 X 10-8 . Calculate the concentrations of H3O+, ClO-, and HClO at equilibrium if the initial concentration of HClO is 0.0090 M.
Explain why the wild horse analogy can be used to help explain a certain type of chemical bonding
What is the pH of the resulting solution if 50 mL of this solution is diluted to 1000 mL Kb = 0.00036.
Calculate the minimum volume of distilled water, in liters, necessary to completely dissolve a 7.5 g sample of AgBr (s) at 298K. The molar mass of AgBr is 188 g mol ?
A Power plant is the main point source of SO2 emissions for a 25 km2 area. Estimate the steady-state concentration of SO2 for this area from this point source given the following temperature data. Windspeed= 5km/hr.
What is the stoichiometric coefficient for oxygen when the following reaction is balanced using the smallest whole number coefficients?
Ozonolysis of C followed by treatment with Zn and water gives CH3CHO and compound D (C9H10O). The proton NMR spectrum of compound D is given below. Treatment of compound D with ethyl magnesium bromide yields A. Draw the structures of compounds A, ..
A solution of glyceraldehyde, C3H6O3, has a density of 1.15 g/mL, and a mass percentage of 28.1% glyceraldhyde at 25 deg C. (molar mass = 90.078g/mol)
Alcohols can be oxidized by chromic acid derivatives. One such reagent is pyridinium chlorochromate, (C5H5NH )(ClCrO3-), commonly known as PCC
What is the maximum no of S.F possible in final result (concentration of NaOH)? Explain.
what fators are generally responsible for the variaion in the base strength of nitrogen
if a 2 m telescope is observing a wavelength of 600 nm what is the smallest resolvable angle in arc
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