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An archaeological sample contains .755 curies of lead-206 and 1.455 curies of uranium-238. Assume that all the lead now present in the rock came from the radioactive decay of the uranium and that no appreciable amounts of other radioactive nuclides are present in the sample. The half-life of uranium-238 is 4.51 x 109 years. What is the age of the sample?
Dissolve Ca(OH)2(s) into a 100 mL solution containing 2.00g of dissolved CaCl2. The satureated Ca(OH)2 solution has an equilibrium pH of 11.68. Determine the molar solubility and the Ksp for Ca(OH)2 from this single pH measurement.
Calculate the pH of a solution made by mixing 50.0 mL of 0.100 M NaCN with 11.82 mL of 0.438 M HClO4 . pKa for HCN = 9.21
Development of an understanding of the fundamentals of HPLC and GC - Development of practical skills that allow the separation of the components of a mixture.
A constant electric current deposits 0.365 g of silver metal in 12,960 secs from a solution of silver nitrate. What is the current. What is the half reaction for the deposition of silver
determine the osmotic pressure of an aqueous solution containing 250 g of glucose c6h12o6 in a total volume of 1.0 l
would a given amount of flourine react with different masses of the two hydrogen isotopes? Does this violate the law of definite proportions.
Calculate the atomic mass of the metal. A 0.194 gram sample of a metal, M, reacts completely with sulfuric acid according to: M + H2SO4 --> MSO4 + H2
Question- Calculate the Ecello for reduction of Cu2+ ions with silver metal and determine if the electrochemical reaction is product- or reactant-favored and explain why.
The tank is first evacuated, and then it is connected to a 50.0 L cylinder of compressed nitrogen gas. The gas pressure in the cylinder, originally at 21.5 atm, falls to 1.55 atm without a change in temperature. What is the volume of the tank?
Explain what proportions of hexane and heptane by mass, must be mixed in order to achieve the greatest free energy of mixing delta G mix
Which halide will react faster with sodium iodide in acetone: 1-bromobutane or 1-chlorobutane. Explain how the nature of the leaving group affects the rate of an SN2 reaction.
A 2.78 L sample of hydrogen chloride (HCl) gas at 2.61 atm and 28°C is completely dissolved in 651 mL of water to form hydrochloric acid solution. Calculate the molarity of the acid solution. Assume no change in volume.
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