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Boron has primarily two isotopes one withatomic mass of 11 amu and the other with an atomic mass of 10 amu.if the abundances of the boron atom with a mass of 11 amu is 18.9%and the abundance of the other isotope is 81.1% what would be the average mass of the boron?
Determine the energy of 1.60 mol of photons for each of the following kinds of light. Infrared radiation (1510 nm)
The coinage metals -- copper, silver, and gold -- crystallize in a cubic closest packed structure. Use the density of copper (8.95 g/cm3) and its molar mass (63.55 g/mol) to calculate an approximate atomic radius for copper.
a certain second order reaction required 60.2 seconds for the concentration to drop from 0.50 m to 0.36 m. how long
the reaction of the Grignard reagent containing more carbon atoms with the carbonyl compound containing less carbon atoms andscheme two involves the reaction of the Grignard reagent containing less carbon atoms
A mixture containing 0.432 mol He(g), 0.312 mol Ne(g), and 0.721 mol Ar(g) is confined in a 8.00 L vessel at 25 °C and a total pressure of 2.92 atm. Calculate the partial pressure in atm of the He gas.
Calculate the number of grams of anhydrous sodium oxalate needed to prepare 250 mL of .04500 M sodium oxalate solution.
Formic acid, HCHO2, is a convenient source of small quantities of carbon monoxide. When warmed with sulfuric acid, formic acid decomposes to give CO gas
What are 3 theoretical reaction mechanisms that can occur with bromine addition to trans-cinnamic acid. The last mechanism accounts for a mixture of syn and anti products
Draw a structure containing only carbon and hydrogen that is a chiral alkyne with six carbon atoms.
considering the given equation as al2o3s rarr 4 als 3 o2g . where ?h 3339.6 kjmol determine ?h for the formation of
From the following data, calculate the delta G for the reaction at 25 degrees C. delta H = -199 kJ/mol delta S = -4.1 Joule/Kelvin - mol these are the Standard values of formation at 25 deg C.
Explain the difference between exposure to radioactivity from a source external to the body versus a source that has been consumed and is therefore inside the body.
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