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A patient is given 0.050 mg of technetium-99m where m means metastable- an unstable but long lived state), a radioactive isotope with a half-life of about 6.0 hours. Explain how long until the radioactive isotope decays to 6.3 * 10-3 mg?
What volume of O2 gas (in L), measured at 782 mmHg and 25C is required to completely react with 53.2 g Al
An isotonic solution contains 0.95% by mass per volume. Calculate the percent mass per volume for isotonic solutions containing each of the following solutes at 50 degree Celsius . Assume a van't Hoff factor of 1.9 for all ionic solutes.
what mass of PbSO4, is produced when 25.0 Ml of 0.2338M Pb(NO3)2 solution is added to 25.0 mL of 0.0971M Al2(SO4)3 solution,
A fuel gas containing 90% methane (CH4), 5% acetylene(C2H2) and 5% butane gas(C4H10) by volume is fed to a furnace in which it is completely burned with 10% excess air. The fuel gas flow rate is 1000 m^3/h at 15 degrees Celcius and 250 kPa.
a 1.00 g sample of d2o and h2o are reacted with cl2 and hcl and dcl are produced. then they are diluted with h2o giving
Two acid-base reactions are given below. Of the three reaction arrows presented in each reaction, select the arrow (via the multiple choice circle before it) that best indicates the acid-base equilibrium position
A galvanic cell consists of an electrode composed of aluminum in a 1.0 M aluminum ion solution and another electrode composed of silver in a 1.0 M silver ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 2..
Calculate the temperature of boiling water at an elevation of 6000ft (2000m) given that the atmospheric pressure is 0.8atm. Assume delta H_vap is independent of T.
A sheet of aluminum foil has a total mass of 1.000ft2 and a mass of 3.745g. What is the thickness of the foil in millimeters. (Density of Al = 2.699 g/cm3.)
How many micrograms of fluoride are present in 2.0 g of a solution that has a fluoride concentration
Once the solvent front reaches the top of the chromatographic paper,solvent begins to evaporate from the top edge of the paper, and the remaining solvent continues to move up the paper.
a student placed 10.5 of glucose in a volumetric flask added enough water to dissolve the glucose by swirling then
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