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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
Starting with initial concentrations of 0.400 M and .600 Mconcentrations of nitrogen and hydrgon respectively, the abovereaction is allowed to come to equilibrium
A gas evolved during the fermentation of sugarwas collected. After purification its volume was found to be25.0 L at 22.5°C and 702 mmHg. How many grams of gas were collected?
Two compounds with partition coefficients of 15 and 18 are to beseparated on a column with Vm/Vs = 3.0 andtm=1 min. calculate the number of theoretical plates needed to produce a resolution of 1.5.
An infinitely sharp zone of solute is placed at the center of acolumn at time t = 0. After diffusion for time t1, the standard deviation of the Gaussian band is 1.0mm
Deuterium, 2H (2.0140 u), is sometimes used to replace the principal hydrogen isotope 1H in chemical studies.The percent natural abundance of deuterium is 0.015%.
The heat capacity of lead is 0.13 J/g. degrees C. How many joules of heat would be required to raise the temperature of 15 g of lead from 22 degrees C to 37 degrees C?
How much acetone would there be in a solution containing 1kg of water and acetone at the same concentration asshe had in her experiment?
In the reaction of ethanol with KBr in the presence of H2SO4, diethyl ether may be formed as byproduct. Describe by means of a set mechanism, the formation of this by product?
4L of N2 is saturated with water vapor at 22Celsius degree and then compressed to half of its volume What is the partial pressure of H2O in the compressed gasmixture?
Two previously undeformed cylindrical specimens of brass are to be strain hardened by reducing their cross-sectional areas (while maintaining their circular cross sections). For one specimen, the i
For a locus with two alleles (A and a) in a population at risk from an infectious neurode generative disease, 16 people had the genotype AA, 92 had genotype Aa, and 12 had the genotype aa.
Calculate the molar concentration of H3O+ in a.3 M HNO2 (aq) solution. HNO2 reacts with NaOH(aq) in a neutralization reaction.
A 1 kg sample of nitroglyceride C3H5N3O9 explodes and releasesgases with the temperature of 1985 celcius at 1 atm. What is the volume of gas produced?
Calculate the mass of sodium acetate that must be added to 500.0 mLof .2 M acetic acid to form a pH = 5.00 buffer solution.
A constant electric current deposits 0.365 g of silver metal in12960 seconds from a solution of silver nitrate. What is thecurrent? What is the half reaction for the deposition of silver.The Molar
How much sodium hydroxide in grams must be added to a sampleof seawater to completely precipitate the 83.2 mg of magnesiumions present?
The diffusion coefficient for nitrogen insteel at this temperature is 6.2 × 10-11m2/s, and the diffusion flux is found to be 3.5 ×10-7 kg/m2-s.
Benzene and toluene for nearly ideal solutions. the boiling point of pure benzene is 80.1oC. Calculate the chemical potential of benzene relative to that of pure benzene when χbenzene = .30 at i
How many grams of water can be produced from the combination of 25 grams of hydrogen and 225 grams of oxygen? How much of which element will be left over?
When 1.50g of Ba is added to 100g of water in a container open tothe atmosphere, the reaction shown below occurs and the temperature of the resulting solution rises from 22 degrees to 33.10 degrees.
he laser in most supermarket barcode scanners operates at awavelength of 632.8 nm. What is the energy of a single photonemitted by such a laser? What is the energy of one mole of these photons?
The shark tank at an aquarium houses 5 sharks that deplete theaquarium water of a total of 50.00 grams of oxygen per hour. Waterfrom the tank is diverted through a bubbler unit that oxygenates the w
The equation, A = a*b*c becomes nonlinear at high concentrations of the absorbing substance. Suppose you prepare a solution with a very high absorbance that is suspect in not following the linear re
If you were monitring the titation by visivle spectroscopy, what wavelength would you select for the data analysis? Why? How would you determine the endpoint of the tittaion based on the the recored