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Problem- The specific rate constant for the decay of Tc-95 (Technetium 95 is a radioactive isotope) Te is 0.0346 h-1. What is its half-life?
(a) 10.6 h (b) 8.70 h (c) 28.9 h (d) 0.0499 h (e) 20.0 h
I need help for above question. Show each steps for the above problem.
How many grams of sodium lactate must be added to a 1.00 L solution of 0.400 M lactic acid to make a buffer with a pH of 3.70
Human and chameleon insulins have the same amino acid sequence, with the exception of six amino acids, as shown below. Is the pI of human insulin lower, higher, or the same as that of chameleon insulin?
How much energy would be required to melt 48 g of HCl at its melting point of -110.8C? Hfus for HCl is 14.2 cal/g and Hvap for HCl is 98.7 cal/g.
How many millilitres of 0.200 M HCl must be added to 50.0 mL of a 0.200 M solution of NH3 in order to prepare a buffer that has a pH of 8.60? Kb of NH3 = 1.8 x 10-5.
mixture of the same bromoalkanes, and they both undergo hydroboration/oxidation to give a mixture of the same alcohols. Determine What is the structure of B?
what is the molar mass of a gas that has a density of 1.02g/L at 0.990 atm pressure and 37 o C
Explain how to draw NMR structures for compounds that meet these descriptions: a. C2H60; one singlet b. C3H7Cl; one doublet and one septet c. C4H8Cl20; two triplets d. C4H8O2; one singlet, one triplet, and one quartet Any help would be greatly app..
For silver metal, the velocity of electrons emitted utilizing 200 nm photons is 7.42 x 105 m s-1. Compute the work function of silver in eV.
The vapor pressure of water at 20degrees Celcius is 17.5 mmHg. What is the vapor pressure of water over a solution prepared from 2.00x10^2g of sucrose(C12H22O11) and 3.50x10^2g water
A student is given a soluble sodium salt containing one of eight possible anions (negative ions): acetate, chloride, bromide, iodide, sulfide, sulfate, and phosphate. The student adds some BaCl2 solution to the salt solution. A precipitate forms. ..
When the compound spontaneously decomposes, the piston moves up, the temperature of the water reaches a maximum of 29.52°C, and then it gradually decreases as the water loses heat to the surrounding air.
A stellar object is emitting radiation at 3.75 mm. If the detector is capturing 3.3*10^8 protons per second at this wavelength, what is the total energy of the photons detected in one hour
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