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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?
If Amberlyst 21 has a concentration of active site of 1.25 eq/L and we want to use 100 mL of a solution, how much Amberlyst 21 should we use
Write the cell reaction and electrode half-reactions, and calculate the standard potential for each of the following cells: a) Pt|Fe3+(aq),Fe2+(aq)||Sn4+(aq),Sn2+(aq)|Pt
An unknown solid compound containing Pb2+ ion was mixed with 15 mL of 2.0 M HNO3. The mixture bubbled profusely. After complete reaction, it was found that 0.020 moles of CO2 were produced and the original solid was completely consumed.
Write the anti-periplanar Newman Projection for the first step of the elimination. Using this conformation, be sure to write the correct geometry of the resulting intermediate
Given the values of ?Hfo in kJ/mol and So in J/mol K given below, calculate the value of ?Go in kJ for the reaction at 298 K.: NH4Cl(s) => HCl(g) + NH3(g) ?Hfo (NH4Cl) = -312.4 ?Hfo (HCl(g)) = -91.5 ?Hfo (NH3) = -44.5 So NH4Cl(s) = 93.9 So HCl(g) ..
What were two significant differences between the spectra of curcumin and tetrahydrocurcumin
Calculate the equilibrium concentrations if the initial concentrations are 2.31M N2 and 0.54M O2. (This N2/O2 concentration ratio is the ratio found in air.)
Calculate the grams of iron ion present in a 1.25 mL of a solution that required 2.20mL 0f 0.002115 M KMnO4 in a titration going to a faint pink endpoint.
how many rotational levels are there, approximately, between v=0 and v=1 vibrational levels, which are 559.71 cm-1 apart in energy? B=0.2441 cm-1.
Isopropyl alcohol (I.P.A.) has a flash point of 53 degrees Fahrenheit. The outside temperature is 68 degrees Fahrenheit. While this product is being unloaded from a truck
Which molecule has only 90° and 180° bond angles and one lone pair of electrons on the central atom. XeF4 SeF4 BCl3 ClF5
Organic Chemistry Lab: Reduction and Spectroscopy, 1. Sketch the NMR spectrum you would expect to observe for the following compounds:
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