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Iodine-131 has a half-life of 8.0 days. If a person ingests 2.5 mg of NaI labeled with iodine-131, how much of the radioactive isotope remains in the body after 30. days
A 15.6 mL sample of vinegar, containing acetic acid, HC2H3O2, was titrated using 0.6216 M NaOH solution. The titration required 19.80 mL of the base. Assuming the density of the vinegar to be 1.0 g/mL, what was the percent (by mass) of acetic acid..
Acetone (nail polish remover) has a density of 0.7857 g/cm^3. a. What is the mass, in g, of 28.56 mL of acetone? b. What is the volume, in mL, of 6.54 g of acetone?
a buffer is prepared by combining 10.0 g of NaH2PO4 with 150 mL of 0.20 M NaOH and diluting to 2.0 L. what is the pH of the buffer? (Ka (H2PO4-)= 6.2 x 10^-8)
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
Write equations illustrating the reactions with water of the following acids. Indicate strong acids with a single arrow and weak acids with equilibrium arrows. Use hydronium ion in you answer if needed.
The rate of phosphorus pentachloride decomposition is measured at a PCI5 pressure of 0.015 atm and then again at a PCl5 pressure of 0.30 atm. The temperature is identical in both measurements. Which rate is likely to be faster
Determine the concentration in molarity (M) of a crystal violet solution based on a measured absorbance of 0.652 at 590 nm at a path length of 1.0 cm
How will the following changes alter the concentration of CO2(g) in the following reaction exothermic reaction? C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(g)
The ionic radii of Cs+=.174nm, radius of Cl-=.181nm, and the coordination numberof each ion=8, Calculate the lattice parameter
What is the pH of the solution created by combining 2.90 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)?
Calculate the entropy change in the surroundings associated with this reaction occuring at 25 degrees C. Show all your calculations. The change in enthalpy for the reaction is +163.2 kJ. 2N2(g) + O2(g) ---> 2N2O(g)
Write a balanced equation for the reaction that occurs when hydrogen sulfate ion behaves as a Brønsted-Lowry acid in water.
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