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Natural sodium consists entirely of the isotope 23Na whose cross section for thermal neutron capture is 0.53 b. When 23Na absorbs a neutron, it becomes 24Na, which is beta-radioactive with a half-life of 15.0 h. A sample of a material that contains sodium is placed in a thermal neutron beam whose flux is 2.0 × 1018 neutronsm2 . s for 1.00 h. The activity of the sample is then 5.0 µCi. How much sodium was present in the sample? (This is an example of neutron activation analysis, a very sensitive technique.)
Question- A buffer that contains 0.135 M acid, HY, and 0.228 M of its conjugate base, Y-, has a pH of 8.78. What is the pH after 0.0012 mol of Ba(OH)2 is added to 0.355 L of this solution?
The dissolution of ammonium nitrate occurs spontaneosly in water 25 degrees celcius. As NH4NO3 dissolves, the temperature of the water decreases. What are the signs of Delta H, Delta S, and Delta G for this process
fluorine-18 undergoes positron emission with a half-life of 1.1x102 minutes. if a patient is given a 248mg dose for a
A worker in the stock room notices that the labels have fallen off of 5 bottles. the lablels read benzaldehyde, 2-hexanone,pentanal, cyclohexanol, and 2-hexanol. devise a procedure to determine how to eliminate what is contained in each bottle and..
Compute the molar repulsion energy between two nitrogen's nuclei if they are separated by 1.1 Angstroms assume that no electrons are present.
Some plants require acidic soils for healthy growth. Which would be more productive to add to the soil in order to make it more acidic, Fe2(SO4)3 or Na2SO4, and why
Calculate the maximum non-expansion work that can be done on the surroundings from the combustion per kilogram of H2(g) at constant pressure and 298.15K.
At low temperatures, xenon freezes to a solid having a density of 5.653 g/cm3. Below 84 K, argon also freezes to a solid that has a similar structure but different volume and mass.
Most of the product is formed by anSN2 reaction. Give a mechanism for the reaction showing the transition state and explain why it leads to inversion of the configuration and give a perspective formula and a name of the main product of this reacti..
oxygen makes up 46.7 by mass of the earths crust. how many grams of oxygen are present if a sample of the crust has a
Which reagent is used in excess? How great is the molar excess (how many times greater)? I'll add the procedure images in the comments
Complete the following table: Compound Mass Moles
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