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A) By mass spectral analysis, a sample of strontium is known to contain 2.64x1010atoms of Sr-90 as the only radioactive element. The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life (in years) of Sr-90.
B) How long will it take (in years) for the disintegration rate of this sample to drop to 886 disintegrations per minute?
C) How long will it take (in years) for the disintegration rate of this sample to drop to 886 disintegrations per minute?
Discuss the consequences in terms of Type I or Type II errors if the cutoff range is changed by using i) the 1' percentile or ii) the 10th percentile of the disorder ranges
With the help of the sawhorse representations and newman projections illustrate the stereochemistry of the products from the E2 dehydrobromination of (R,R) and meso-(R,S)-2,3-dibromobutane
Using 80.0g of Methane and 16.3g of Water, how many liters of H2 can be produced at STP? What is the limiting reactant?
If 4.21*10^-3 moles of Ca^2+ react with excess PO4^3- to form calcium phosphate, how many moles of the solid will form.
Define how would value for equivalence weight be affected if a few of the H2 gas produced during the reaction of Mg(s) and acid escaped from gas buret
Write ionic and net ionic equations for the following reactions. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.)
Problem- Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation
Calculate the degree of dissociation by A) assuming ideal behavior and B) using a mean activity coefficient y=0.93. The concentration of the acid is 0.010 M.
If 1.35g of AgNO3 is dissolved in 115 mL of water, and to this solution is added 5.00 mL of 1,45M HCl resulting in the formation of a precipitate. Find the concentration of silver ions remaining in the solution.
polonium-218 is an alpha emitter with a half-life of 3.0 minutes. if a sample contains 55 mg of po-218 atomic mass
What are the temperature-dependent properties of materials used in making thermometers?
the enzyme aldolase conversion of fructose 16-biphosphate indihydroxyacetone phosphate and glyceraldehydes-3-phosphate.
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