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Boron has two stable isotopes with masses of 10.01294 u and 11.00931 u. The average molar mass of boron is 10.81 u. What is the percent abundance of each isotope?
An alkyne of six carbon atoms gives the same single product in its reaction either with BH3 in THF followed by H2O2 /OH-, or with H2O/Hg2 /H3O . Draw the structure of the alkyne (containing only carbon and hydrogen atoms).
if it takes 1.0 g of solid NaOH to change the pH of the solution containing a strong acid from 1.00 to 2.00, how much solid NaOH would be needed to change the Ph of this solution from 2.00 to 3.00? Assume that there is no change in the volume of t..
What is the minimum amount of 5.2 M H2SO4 necessary to produce 23.0 g of H2? according to the following reaction. 2Al(s)+3H2SO4(aq)-->Al2(SO4)3 (aq)+3H2(g)
The unknown solution is composed of 50.0 g of nitrobenzene and 5.00 mL of the liquid unknown. Freezing point for nitrobenzene is 5.20 degrees C
a wooden object from the site of an ancient temple has a carbon-14 activity of 13.0 counts per minute compared with a
A bicyclist passes beneath it, traveling in a straight line at the constant speed of 10 m/sec. How fast is the distance between the bicyclist and the balloon increasing 2 seconds later?
A particular first-order reaction has a rate constant of 1.35x10^2 at 20 degrees C . What is the magnitude of k at 75 degrees C if Ea =85.6Kj/mol?
What is the mRNA sequence for the following segment of DNA: GACTATCCCATAGAG Based upon the mRNA sequence, what is the peptide sequence
Fish produce glycerol to survive the freezing waters of the Arctic. Determine the degree to which the freezing point of blood and other biological fluids is lowered with the help of glycerol. What is the ideal concentration range of glycerol requi..
with 8 g of methane and 10g ammonia how much hydrogen cyanide will be formed?
Find the pH and percent dissociation of a 0.100 M solution of a weak monoprotic acid having the following Ka value. Ka = 1.0 x 10^-5
Given that the density of solid sodium is 0.968 g/cm^3, estimate the atomic (metallic) radius of a Na atom. Assess the value obtained, indicating why the result is only an estimate and whether the actual radius should be larger or smaller than the..
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