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A radioactive sample contains 1.30g of an isotope with a half-life of 3.5 days. What mass of the isotope will remain after 5.6 days? (Assume no excretion of the nuclide from the body.)
How many constitutionally isomeric monochlorides can be formed in the free-radical chlorination of 2,2,4-trimethylpentane?
A 120 pound woman working in an office consumes about 2200 kcal/day, whereas the same woman climbing a mountain needs 3400 kcal/day.
What is the minimum wavelength of light needed to break the C-C bond? Could UV lamps be used to break the C-C bond?
State the composition and the properties of the ketohexose derived from fruit jam. Describe the manner in which ketohexose acts as a reducing sugar in the test.
consider the combustion of methane, CH4:CH4 + 2 O2 (g) -->CO2(g) + H2O suppose 1.5 mol of methane is allowed to react with 4 mol of oxygen what is the limiting reagent?
The cell potential of the following electrochemical cell depends on the ph of the solution in the anode half-cell:
a 365.0g sample of water,contains 23mg Au. How much gold is present in the sample in parts per million?
A 0.0100 L sample of H2SO4 (Sulfuric Acid) was titrated with 0.150 M NaOH. It took 23.3 mL of NaOH from the buret -- that's 0.0233 L -- to reach the titration endpoint.
consider the reaction : 3A (g) + 2B (g) = 4 C (g) a ) determine the expression for the rate of the reaction with respect to each of the reactants and products
start with 4-cyclopentylphenol and react with NaOH, CH3I, NBS, heat show each step to get the final product.
calculate the molarity of a solution made by dissolving 12.5 grams of Na2CrO4 in enough water to form exactly 550mL of solution
for ammonia, Kb is 1.8*10^-5, to make a buffered solution with pH of 10.0, the ratio of [NH4+] to [NH3] must be
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