Calculate the activity of a pure 5.8-μg sample of 3215P (T12=1.23×106s).
Calculate the activity of a pure 5.8-μg sample of 3215P (T12=1.23×106s).
The activity of a sample of 35 16S (T12=87.32days) is 3.05×104 decays per second. What is the mass of the sample?
For a 90 mg Ra-226 sample (T12 = 1,600 years) with an activity of 3.29 x 10 Bq, compute the following. (a) 1 in Bq) Bg (b) the number of atoms in the sample, based on mass considerations atoms (c) the number of atoms in the sample based on its activity atoms
1. Calculate the activity of a 200.0 g sample of natural potassium. Express your answer both in Curies (Ci) and in Becquerel (Bq). 1 Bq = 1 nuclei s−1 1 Ci = 3.700×1010 nuclei s−1 2. Technetium-99m is a metastable form of technetium-99 (isotopic mass = 98.9062547 u) and has a half-life of 6.0058 hours. How many grams of Tc-99m are required to have an activity of 50.0 μCi? 3. Ytterbium-169 is a radioactive isotope. 10.0 μg of pure Yb-169...
The initial concentration of a protein sample is 25 μg/μl. Calculate the volumes of the stock protein and water (diluent) necessary to prepare a 1:5 dilution in a final volume of 4 mL. What is the diluted concentration? Volume of Protein: Volume of Water: Resulting Concentration:
A sample of radioactive material is initially found to have an activity of 114 Bq. After 4 days and 5 hours, the activity of the sample is found to be 85 Bq. 1) Calculate the disintegration constant of this material. 1 = 51 Submit 2) Calculate the half-life of the material. T12- days Submit 3) How long from the beginning (when the activity was 114 Bq) did it take for the sample to reach an activity of 10 Bq? t...
At 1.23 atm and C 1.70 ∘C , a 3.34 g sample of gas occupies a volume of 1560 mL. Calculate the molar mass of the gas.
A sample of pure copper has a mass of 14.0 g. Calculate the number of moles in the sample and copper atoms in the sample. (a) moles in the sample (b) copper atoms in the sample
The temperature on a sample of pure X held at 14.3 atm and 108°C is decreased until the sample condenses. The temperature is then held constant and the pressure is increased by 5.8 atm. On the phase diagram below draw a path that shows this set of changes. XS ? pressure (atm) temperature (K)
A sample of CCl4 with a pressure of 1.23 atm and a volume of 240 mL is allowed to react with excess CH4 at 127 °C. CH4 (g) + CCl4 (g) --> 2 CH2Cl2 (g) Calculate the pressure of the CH2Cl2 produced in the reaction if it is transferred to a 2.77-L flask and cooled to 28 °C. _____atm
A pure sample of 6.50 × 106 mol of a pure molecular substance has a mass of 3.64 × 105 kg. Calculate the relative molecular mass of the substance and the number of molecules that would be contained in a pure sample of the substance of mass 7.50 kg.