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A block of zinc has a density of 7.133 g/cm^3 and atomic weight of 65.39 g. A) Calculate the atom density of the zinc. B) Find the macroscopic thermal neutron absorption cross section for zinc, assuming that microscopic cross section for absorption of zinc is 1.10 barns.
why is preferable to use tflon or ungreased stopcock rather than greased stopcock in column chromatography experiment?
Describe how you would prepare each of the following aqueous solutions. - 230 g of a solution that is 0.60 molal in Na2CO3 starting with the solid solute.
How much heat is emitted when 4.55 of water condenses at 25 ? The heat of vaporization of water at 25 is 44.0.
What is the stereochemical relationship of the products formed by reacting racemic lactic acid with (S)-1-phenylethylamine?
When a sample of neon with a volume of 628 mL and a pressure
You are given an unknown sample that when treated with hydrochloric acid forms a precipitate. After decantation, you add boiling water to the solid. All of the solid disappears.
Carbonate buffers are significant in regulating PH of blood at 7.40. Calculate the concentration of Carbon dioxide in a 0.200M NaHCO3 at PH=7.40.
SLIGHTLY LESS than 100 degrees Celsius, but the final boiling point was AT 100 degrees Celsius. Why should the boiling point rise as the distillation progresses?
What is the numerical value of the rate constant and what are the units? and Calculate the rate of this reaction when the initial concentrations of OCl- and I- are 7.6 x10-3 M and 9.6 x 10-3M respectively.
Three students in the class determine the weight of the crucible by repeated weighings on a simple balance. (A) Using the following information, which student has done the most accurate determination? (B) Which student has done the more precise de..
The heat of fusion of ice (the heat associated with ice melting) is 6.0 . Find the temperature of the coffee after the ice melts.
What is the enthalpy of combustion (in kJ/mol) for acetone (CH3COCH3) under standard conditions (water is produced as a liquid)? Use the appendix in your textbook, do not enter units, and answer with 5 significant digits.
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