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1.The remains of an old camp?re are unearthed and it is found that there is only 80% as much radioactive carbon-14 in the charcoal samples from the camp?re as there is in modern living trees. If the half-life of carbon- 14 is 5730 years, how long ago did the camp?re burn?
2. A bacteria population grows exponentially with growth rate k=2.5 how long it would take for the bacteria population to double its size?
3. The half-life of a certain drug in the human body is 8 hours how long it would take for a dose of this drug to decay to 0.1% of its initial level?
2-Methylpentane and 4-methyl-2-pentanone are constitutional isomers with the molecular formula C6H12O.each shows a molecular ion peak in its mass spectrum at m/z 100.
Calculate the concentration of the acetate ion (mol/L) in a solution prepared by dissolving 1.00×10-2 mol of HCl(g) in 1.00 L of 9.00×10-1 M aqueous acetic acid. Equilibrium constants may be found in an appendix to your text.
Draw the structures and then List the following alkyl halides in order of their increasing reactivity as substrates in SN2 reactions
Describe in brief the risk connected with solutions of 1M NH 3 , 1M HCl, and 1M NaOH?
How much heat energy would be needed to raise the temperature of a 15.0 g sample of iron (C = 0.448 J/goC) from 22.0 oC to 100.0 oC?
Two syntheses using a grignard reagent, starting with an alkyl halide and later
What is the final concentration of Na+ after adding 230 ml of water to a stock solution of 2.5M 420.0 ml Trisodium phosphate?
For the neutralization reaction involving HNO3 and Ca(OH)2, how many liters of 1.55 M HNO3 are needed to react with 45.8 mL of a 4.66 M Ca(OH)2 solution?
For 220.0 mL of a buffer solution that is 0.205 M HCHO2 and 0.295 M KCHO2, calculate the initial and the final pH after adding 0.010 mol of NaOH.
The corresponding densities of liquid water and water vapor are 0.958 kg/L and 0.000598 kg/L, respectively. Calculate the change of pressure for a one degree change in temperature.
Calculate the theoretical yield of C2H5Cl when 138 g of C2H6 reacts with 218 g of Cl2, assuming that C2H6 and Cl2 react only to form C2H5CL and HCl.
The volume of a sample of hydrogen is 798mL and it exerts 621mmHg pressure at 5.00C. what volume does it occupy at standard temperature and pressure.
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