When BF3 is bombarded with neutrons, the boron undergoes an α decay, but the F is unaffected. A 0.20 mol sample of BF3 contained in a 3.0 L container at 298 K is bombarded with neutrons until half of the BF3 has reacted. What is the pressure in the container at 298 K?

What is the binding energy in kJ/mol Cl for chlorine-35? The required masses (g/mol) are: H= 1.00783;n= 1.00867:35C1= 34.96885 kJ/mol

An air sample from a Normal, Illinois basement was found to have a radon activity level of 0.722 Bq/L. If the sample was analyzed 29 days after collection, what was the original activity of the sample? (Radon-222 has a half life of 3.8 days).

From Chernobyl, 6e6 Ci of Cs-137 was released in 1986.  Cs-137 has a half-life of 30 years.  The released activity decays to _____ Ci in 2022.

Fluorine-18 is a radioactive isotope use in a variety of medical imaging proceduresincluding positron emission tomography (PET) scans. Fluorine-18 decays by positron emissionwith a half-life of 1.83 hours. A medical sample containing 18F has an activity of 4.00 millicuries. How many picograms of18F are present in the sample? The atomic mass of 18F is 18.00 g/mol. (1 picogram = 1×10–12g 1 Curie = 3.7×10–10 decays/sec 1 millicurie = 1×10–3 Curies)