A common issue in nuclear medicine is the short half-life of materials used for tests like PET or CT scans. The materials must be manufactured nearby so that they can be transported to a hospital quickly enough to be used for a patient when needed. It can be a tremendous advantage for a hospital to be near a laboratory capable of manufacturing rare isotopes. A good example of this is the F-18 isotope used for PET scans. It has a half-life of about 110 minutes. If a 50.0 mg sample of F-18 leaves the laboratory at 8:00 am, how many milligrams of F-18 remains in the sample when it arrives at the hospital at 1:30 pm?

When 225mg of anthracene, c14h10(s), was burned in a bomb calorimeter the temperature rose by 1.75k. calculate the calorimeter constant. by how much will the temperature rise when 125mg of phenol, c6h5oh(s), is burned in the calorimeter under the same conditions? (δch< (c14h10,s)=–7061 kj mol−1.)

One of the few xenon compounds that form is cesium xenon heptafluoride (csxef7). how many moles of csxef7 can be produced from the reaction of 13.0 mol cesium fluoride with 12.5 mol xenon hexafluoride? csf(s) + xef6(s) csxef7(s)

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.