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Problem: What is the half-life of polonium-218 if 9.12 minutes are required for the activity of a sample of polonium-218 to fall to 12.6 percent of its original value?
Iron-59 is a radioisotope that is used to evaluate bone marrow function.
The half-life of iron-59 is 44.5 days. How much time is required for the activity of a sample of iron-59 to fall to 17.6 percent of its original value?
In a separate experiment with the same initial conditions, a pressure of 2.50 was applied to the gas, decreasing its volume from 4.40 to 1.76 in one step. If the final temperature was the same for both processes, what is the difference between for..
Propyl alcohol (CH3CH2CH2OH) and isopropyl alcohol [(CH3)2CHOH], whose space-filling models are shown, have boiling points of 97.2 °C and 82.5 °C, respectively. Explain why the boiling point of propyl alcohol is higher, even though both have the m..
The enthalpy of combustion of benzoic acid is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be 3226.7kJ/mol.
Calculate the concentration (molarity) of iron in a dilutedsolution if 5.00 mL of 5.0x10^-4 M Fe(NH4)2(SO4)2 6H2O isdiluted with water to 100.0 mL.
Write the balanced chemical equation for the neutralization reaction that occurs when an aqueous solution of hydrochloric acid (HCl) is mixed with an aqueous solution of potassium hydroxide (KOH).
a river had a depth of 1 m a width of 40m and a flow of 20 m3sec. assume that the wind speed at 10 m elevation is 4
calculate the pH of the solution that results when 40.0 mL of 0.100 M NH3 is mixed with 20.0 mL of 0.250 M HCl solution.
Calculate the change in enthalpy, ? H, of the reaction (in kJ/mol) of water formed. Enter the appropriate sign (+/-). Enter to 1 decimal place.
Using reaction equations illustrate how would synthesize each of the subsequent from the indicated starting materials. Provide all appropriate reaction conditions.
pH = log[H3O+] , pH + pOH = 14, [H3O+] * [OH-] = 1.0 X 10^-14, pH = -log(0.001) = 3 Could you show me a few of the steps between line one and two in both of these conclusions?
When you calculated K in the rate equation for the reaction of KMnO4 solution and H2C2)4 solution, you assumed k had the same value under the condition of determination 1,2,3 A. What assumption did you make about the reaction of KMnO4 solution and..
A 25cm^3 sample of dilute sulfuric acid contains 0.025 moles of acid. What is the hydrogen ion concentration in the solution? Please explain working.
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