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Radioactive gold-198 is used in the diagnosis of liver problems. The half-life of this isotope is 2.7 days. If you begin with a 5.6 sample of the isotope, how much of this sample remains after 3.0 days?
A hypothetical three step metabolic pathway consists of intermediates W, X, Y AND Z and exzymes A, B, AND C. Assume the order of the enzymatic steps in the pathway from the subsequent information:
A student mixed 5.00 mL of a nickel(2) chloride solution with 5.00 mL of .100M sodium phosphate and a precipitate formed. How many moles of sodium phospahte were present in 5.00 mL of the solution?
An experiment shows that a 250 mL gas sample has a mass of 0.430 g at a pressure of 728 mmHg and a temperature of 26 C. What is the molar mass of the gas?
H2O2 serves as an oxidizing agent or as a reducing agent. write equations for the reactions involved. what is the major difference between the conditions of the two reactions.
we want to prepare a buffer of ph 8.5643 by adding hcn and nacn to 1.860 l of solution. what is the ratio of hcn to
Compute the boiling point of this solution: 1.00 X 10^2g C10H8O6S2(1,5-naphthalenedisulfonic acid) in 1.00 X 10^2g H2O (nonionizing solute).
Lipitor blocks production of chlosterl in the liver. In addition to this reduction of the serum level of cholsterol, HDL acts to remove LDL from the bloodstream. How might this occur?
A 25.00-mL sample of well water containing dissolved iron was treated with hydroxylamine hydrochloride, pH 5 buffer, and 1,10-phenanthroline, and diluted to 100.0 mL. Absorbances were measured at 510 nm using a 1.00-cm cell.
he generated the hydrogen gas needed to lift the balloon by mixing a large amount of iron with aqueous sulfuric acid. if he used 1000 lbs. of iron and excess sulfuric acid, how many liters of hydrogen gas were made?
what is the volume in milliliters of 20.0 g of acetone if the density of acetone is .791 g/ml?
if a 2 m telescope is observing a wavelength of 600 nm what is the smallest resolvable angle in arc
Calculate the expansion work done when 50 g of water is electrolysed under constant pressure at 25 degree Celsius.
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