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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.)
Merely two forces act on an object mass=2.31 kg. Find the magnitude and determine the direction relative to the × axis of the acceleration of the object.
The decomposition of a compound, A, to form B + C is known to be a first order reaction. If the half-life of the reaction is 5.93 minutes at 65 °C, what is the value in min-1 of the rate constant for the reaction at this temperature
If 30 mL of a certain liquid has an initial temperature of 50 degrees and is heated to 100 degrees. What is the new volume of the liquid
How many grams of calcium hydroxide is produced when 3.2 micrograms of CaC2 reacts with 5.1 micrograms of water?
What is the pH of a solution prepared by mixing 200 ml of 0.1 M HCl with 300 ml of 0.1 M sodium acetate and diluting the mixture to 1 L?
Phenol (C6H5OH, also called carbolic acid) has a pKa of 9.89. It is used to preserve body tissues and is quite toxic. Calculate the percent ionized in 0.0399 M phenol--a dilute solution.
Predict the probability P9v) that a molecule will have a given total velocity of more specifically P(v)dv is the probability that a molecule will have a velocity btwn v and v+dv.
What is the absolute error in pKa according to pKa from the mid-point pH value? The true value is given in # (5) (9) What is the relative % error in pKa according to pKa from the mid-point pH value?
Compare and contrast solid-phase DNA synthesis with enzyme-catalyzed DNA synthesis. Please separately describe the similarities and differences between the two.
Based on the stoichiometry, at what point does the limiting reactant change? show calculations to support your answer. The volume of acid HCL (10mL) is constant and mass of metal Mg (0.250g) is constant.
When solving this problem, assume that no heat is lost from the calorimeter to the surroundings, the density of all solutions is 1.00 g/mL, the specific heat of all solutions is the same as that of water, and volumes are additive.
A student synthesized benzyl acetate following Fischer esterification, and combined 3.4 mL benzyl alcohol (MW = 108.14 g/mol, ?= 1.044 g/mL) and 0.57 mL acetic acid (MW = 60.05 g/mol, , ?= 1.049 g/mL) under reflux for 50 minutes.
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