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Our book shows a radioactive decay series in which a sample that starts out as U-238 eventually winds up becoming non-radioactive Pb-206. The half life for this process is extremely long, being 4.51 x 10^9 years. Consider a radioactive mineral sample that is 4.64 grams of U-238 and 1.22 grams of Pb-206 found in Colorado in 1955. If all of the Pb-206 was once U-238, how old is this mineral sample? Hint: find "k" first.
1. about one billion years old
2. about 1.5 billion years old
3. about 2.3 billion years old
4. about 2.75 billion years old
5. about 7.2 billion years old
Determine how many grams of Phosphorus tri-fluoride will be produced when 40.1 g of F2 mix, and the reaction has a 78.1% yield?
Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene (molar mass = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C?
Fluorine-18, which has a half-life of 110 min, is used in PET scans. (see section 4.5.) If 100 mg of fluorine-18 is shipped at 8 A.M., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:..
calculate the wavelength in nm of an electron traveling at 75% the speed of light. (mass of the electron = 5.4858 x 10^-4 amu)
Thirteen grams of titanium react with 60.0 g of bromine. How many grams of titanium(IV) bromide are produced, assuming 100% yield.
Use the activity series to determine if a single replacement reaction can be seen to occur. If a reaction occurs, write the net ionic equation. a) Cobalt metal in a barium iodide solution b) Tin metal in a copper bromide solution
An auto bumper is coated with a layer of chromium, 0.017 cm thick. The bumper has a surface area of 3.43 x 104 cm2. The density of chromium metal is 7.19 g/cm3. How many atoms of chromium are used in the coating?
Estimate the ratios of the basic and acidic forms of the histidine side chain
The reaction of 0.130 moles of a metal with an acidic aqueous solution in a calibrated calorimeter causes the temperature to increase by 49.0°C.
nickel acetate in a volumetric flask and add water to a total volume of 375 mL What is the concentration of the nickel cation? What is the concentration of the acetate anion?
The bacteria Azotobacter chroococcum grows aerobically and plays an important role in the soil nitrogen cycle. Azo can bind atmospheric nitrogen which is inaccessible to plants then release ammonia ions into the soil that plants can absorb
How many molecules of NO2 are produced when 5.38 mol of ammonia is completely reacted?
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