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An element has two common isotopes. 98.89% of its atoms have an atomic mass of 12.09 amu, whereas the other 1.11% have an atomic mass of 13.10 amu. Using the isotopic composition provided, calculate the average atomic mass of the element.
Determine the dissociation constants for the following acids. Express the answers in proper scientific notation where appropriate
Name a metal that could be used in a future experiment to extract the copper from the copper (II) nitrate solution
how many regions of high electron density are there around the central atom of the molecular structure of SbCl3.
Draw line-angle structural formulas for 8 constitutional isomers that have a molecular formula C4H8O.
a) For a weak acid or base the degree of ionization increases with dilution. Explain. b) consider the solutions .01 M HNO3 / .10 M HCL / .01 MHNO2. which solution has the highest ph
The excess I3- was titrated with 50.00 mL of a 0.02000 M Na2S2O3 solution. What was the mass percent of arsenic trichloride in the original sample?
Propose a structure for an amine of formula C4H9N, which liberates a gas when treated with NaNO2 and HCl. The 13C NMR spectrum is as follows
Assume that the maximum number of ATP's is produced (38). At pH 7, and in the presence of excess Mg2+
Carbon-14 has a half-life of 5730 yrs. A living organism has an activity of 15.2 counts per minute (cpm) per gram of carbon. If a bone is determined to have an activity of 3.80 cpm per gram of carbon, how old is the bone
Calculate in kilojoules per mole the energy necessary to completely remove an electron from the first shell of a hydrogen atom R infty = 1.097 times10^-2 nm^-1
Assuming levels of atmospheric CO2 are 390 ppm CO2, what is the pH of rainwater in equilibrium with the atmosphere for the pre-industrial atmospheric CO2 concentration of 280 ppm,v.
An ammonia/ammonium buffer solution contains 0.49 M NH3 and 0.62 M NH4+. The Kb value of ammonia is 1.8x10^5. Calculate the pH of this buffer.
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